Answer:
Plural
Explanation:
When there is more than 1 subject and more than one verb
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.
Your answer will be "capable of being"
think of it as "able to *root*"
It is used to deliver all direct and indirect characterization
