Meaning: 'Backing' means support or endorsement, indicating that these groups feel they have the support of others in their stance against the research.

Wrong options:

• support: While 'support' is a synonym, it does not fit as well in this context since 'backing' conveys a more specific type of support related to endorsement.
• loyalty: 'Loyalty' implies a strong allegiance, which does not directly relate to the context of groups fearing loss of identity as effectively as 'backing'.
• assistance: 'Assistance' refers to help or aid, which does not convey the same sense of endorsement or support that 'backing' does.

Correct answer: essence

Explanation: The word 'essence' is appropriate as it refers to the intrinsic nature or indispensable quality of something, which aligns with the context of individuality. It fits grammatically as a noun that complements 'the' and is singular, matching 'would rob them of'.

Meaning: 'Essence' means the fundamental nature or most important quality of something, in this case, referring to the core of their individuality.

Wrong options:

• extract: 'Extract' refers to a substance obtained from something, which does not fit the context of individuality as it implies a physical component rather than a quality.
• concentrate: 'Concentrate' suggests a focus or a condensed form, which does not convey the idea of intrinsic quality as effectively as 'essence'.
• nectar: 'Nectar' is a sweet liquid produced by flowers, which is unrelated to the concept of individuality and does not fit the context.

Correct answer: crippling

Explanation: The word 'crippling' fits grammatically and contextually as it describes severe limitations or disabilities, which aligns with the effects of autism mentioned. It is an adjective that modifies 'social anxiety', indicating the severity of the condition.

Meaning: 'Crippling' means causing severe damage or impairment, particularly in this context referring to the debilitating nature of social anxiety associated with autism.

Wrong options:

• maining: 'Maining' is not a recognized English word and does not fit grammatically or contextually.
• limping: 'Limping' refers to a physical gait issue, which does not relate to social anxiety and is not an appropriate descriptor in this context.
• hobling: 'Hobling' is also not a standard English word and does not convey any relevant meaning in this context.

Correct answer: concur

Explanation: The word 'concur' fits grammatically as it means to agree, which aligns with the context of researchers sharing a common understanding about autism. It is a verb that complements the subject 'those involved in research'.

Meaning: 'Concur' means to agree or have the same opinion, indicating that researchers share a consensus on the need for better understanding of autism.

Wrong options:

• scorn: 'Scorn' implies contempt or disdain, which contradicts the context of agreement and understanding among researchers.
• concent: 'Concent' is not a recognized English word and does not fit grammatically or contextually.
• permit: 'Permit' means to allow, which does not convey agreement and does not fit the context of researchers' views on autism.