Answer :
C because if you plug that into the sentence it make more sense. Just remember it's is also it is.
~jz
Hope it helps
~jz
Hope it helps
The answer is D; it's. The reason behind this is that the sentence is expressing that IT IS important to their training goals. Since you need the words "it is" to complete the meaning of the sentence, it's clear that the conjunction makes the most sense instead of the other options that are attempts at possessive nouns.