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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.
Option A
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
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A) the physical gestures that function as a child's primary form of communication for a portion of its infancy
This is the correct answer choice. It clearly and precisely communicates the intended meaning of the sentence.
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B) the physical gestures that function for a child's primary form of communication in a portion of its infancy
The word "for" does not express the same intention as the word "as" from answer A)
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C) physical gestures which function as a child's primary forms of communication for a portion of its infancy
The use of "which" makes that this information seems non-essential, which is clearly not the case! Also the removal of the word "The" makes this answer incorrect.
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D) the physical gestures which function as the primary form of communication of children during a portion of its infancy
Pronoun error. Children/it is incorrect
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E) a child's primary form of communication, physical gestures which become their primary form of communication during a portion of their infancy
Pronoun error. Child/their is incorrect