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Here is a detailed explanation to this question-
Abhi077
Communicative intent appears months before children develop the motor mechanisms required for speech, and scientists have conducted research into
the physical gestures that function as a child's primary form of communication for a portion of its infancy.
A) the physical gestures that function as a child's primary form of communication for a portion of its infancy
B) the physical gestures that function for a child's primary form of communication in a portion of its infancy
C) physical gestures which function as a child's primary forms of communication for a portion of its infancy
D) the physical gestures which function as the primary form of communication of children during a portion of its infancy
E) a child's primary form of communication, physical gestures which become their primary form of communication during a portion of their infancy
Choice A: Option A maintains correct idiom and pronoun use, while conveying the intended meaning of the sentence. Thus, Option A is correct.
Choice B: Option B utilizes the phrase "function for", which is unidiomatic; the correct form of this phrase is "function as". Thus, Option B is incorrect.
Choice C: Option C changes the meaning of the sentence by omitting the word "the"; this omission causes the sentence to imply that scientists are studying a broad range of physical gestures, rather than specific ones which function as a child's primary form of communication for a portion of its infancy. Thus, Option C is incorrect.
Choice D: Option D suffers from a pronoun error; the noun "children" is plural, while the pronoun "it" is singular. Thus, Option D is incorrect.
Choice E: Option E suffers from a pronoun error; the noun "child" is singular, while the pronoun "their" is plural. Thus, Option E is incorrect.
Hence, A is the best answer choice.All the best!
Experts' Global Team