Meaning: A 'relationship' refers to the way in which two or more concepts, objects, or people are connected.

Wrong options:

• policy: The term 'policy' refers to a course of action or principle adopted by an organization, which does not fit the context of a connection between workers and machines.
• crisis: A 'crisis' denotes a time of intense difficulty or danger, which is unrelated to the economic connection being discussed.
• supported: The word 'supported' is a verb that implies assistance or backing, which does not convey the idea of a connection or interaction between workers and machines.

Correct answer: replaced

Explanation: The verb 'replaced' is appropriate here as it indicates that human employees would be substituted by machines. This fits grammatically in the passive voice structure and contextually aligns with the loss of jobs due to automation.

Meaning: 'Replaced' means to be substituted or exchanged for something else.

Wrong options:

• policy: 'Policy' does not fit as it is a noun and does not convey the action of substitution required in this context.
• crisis: 'Crisis' is unrelated as it does not imply any action of substitution or replacement.
• supported: 'Supported' is a verb that suggests assistance, which does not fit the context of being substituted by machines.

Correct answer: created

Explanation: The verb 'created' fits grammatically as it indicates the action of bringing something into existence. Contextually, it aligns with the idea of new opportunities arising from the collaboration between robots and humans, enhancing productivity.

Meaning: 'Created' means to bring something into existence or to cause something to happen.

Wrong options:

• policy: 'Policy' does not fit as it is a noun and does not convey the action of generating opportunities.
• crisis: 'Crisis' is unrelated as it does not imply the generation of new opportunities.
• supported: 'Supported' does not fit as it implies assistance rather than the act of generating or creating new opportunities.