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.
Answer:
Treehouses can make special and unique houses. Treehouses are really hard to build and maintain.
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However, some children regularly act in ways that make it hard for other kids to accept them. Helping children with off-putting behaviors to recognize and change these (if possible) can make it. ;)
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