I believe it would be B, because there are two subjects that the speaker is referring to at the beginning of the sentence; the caterpillar and the leaf. When they use the word "it" in the second half of the sentence it is unclear whether they mean to say if "it" is the leaf or the caterpillar which they are carrying to their brother.
"If you can’t fly, then run, If you can’t run, then walk, If you can’t walk, then crawl, but whatever you do, you have to keep moving forward." - Martin Luther King Jr.
The answer is: [A]:
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"<span>Animals cannot acquire any of the four characteristics of language because of physical and mental limitations."
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What are the answer choices?
And what exactly are you wanting??
The phase of the writing process that involves checking the content to see if the essay was detailed and supports the statement is the revising phase. This is an important phase during the writing of a thesis. This will help find mistakes and you can change things is need be. The correct answer is B.