The answer would be A.
The question you have to ask is, is it possessive?
Yes it is possessive.
The wing is owned by the bird. Its wing was broken.
It's means it is or it has.
It's would not make sense in this case because you can not put it is or it has into this sentence.
Indeed the correct answer is
<span>c) small pieces of matter</span>
Not getting the praise he needs, this can make him feel like his hard work is for nothing.