Meaning: Encounters refer to meetings or experiences with something, in this case, nature, suggesting active participation or interaction.

Wrong options:

• aids: Aids typically refer to assistance or support, which does not fit the context of experiencing nature directly.
• structures: Structures imply physical forms or arrangements, which is not relevant to the concept of engaging with nature.
• courses: Courses suggest a series of lessons or classes, which does not align with the idea of direct experiences with nature.

Correct answer: interactions

Explanation: The term 'interactions' is appropriate as it describes the ways in which individuals engage with their natural surroundings, fitting the context of assessing well-being in relation to nature. It is a noun that complements the verb 'assessed' in the sentence.

Meaning: Interactions refer to the ways in which people connect or engage with their environment, highlighting the active participation in nature.

Wrong options:

• elevations: Elevations refer to heights or increases, which do not relate to the concept of engaging with nature.
• radiations: Radiations imply the emission of energy, which is not relevant to the context of human engagement with nature.
• appreciations: Appreciations suggest recognition or enjoyment, but do not convey the active engagement implied by interactions.

Correct answer: equally

Explanation: The word 'equally' fits grammatically and contextually as it describes the distribution of benefits among income groups, indicating that the benefits are not shared in the same manner. It serves as an adverb modifying the verb 'distributed'.

Meaning: Equally means in the same manner or to the same extent, indicating that the benefits are not shared fairly among different groups.

Wrong options:

• actually: Actually implies a contrast or clarification, which does not fit the context of discussing distribution.
• purely: Purely suggests something is done without any other factors, which does not apply to the distribution of benefits.
• politely: Politely refers to courteous behavior, which is irrelevant in the context of discussing the distribution of benefits.

Correct answer: tend

Explanation: The verb 'tend' is appropriate as it indicates a general inclination or tendency, fitting the context of discussing mental health among different income groups. It aligns with the subject 'people with lower incomes' and complements the structure of the sentence.

Meaning: Tend means to have a tendency or inclination towards something, in this case, poorer mental health.

Wrong options:

• incline: Incline suggests a physical tilt or slope, which does not fit the context of mental health.
• enact: Enact means to make something into law or to perform, which is not relevant to the discussion of mental health.
• consist: Consist refers to being made up of certain elements, which does not convey the idea of a tendency.

Correct answer: simply

Explanation: The adverb 'simply' fits grammatically and contextually as it emphasizes the straightforwardness of the statement regarding living near green areas. It modifies the verb 'is' to indicate that the situation is not complicated.

Meaning: Simply means in a straightforward or uncomplicated manner, indicating that just living near these areas is not sufficient for benefits.

Wrong options:

• rightly: Rightly implies correctness or justification, which does not fit the context of discussing sufficiency.
• originally: Originally refers to the beginning or initial state, which is irrelevant in this context.
• really: Really emphasizes truth or reality, but does not convey the simplicity of the situation as effectively as 'simply'.