The answer is C because the other options are like opinions and C is a fact not an opinion.
A rhythm makes a poem what a poem is. Without rhythm than your poem whould be sloppy and unreadable. The effect it has on a poem is that it makes it readable and interesting. Hope that helped
They want you to pick an answer that best supports the reason
During those months Rachel's mother looked after Aaron with something close to genuine fondness-- not pity, not obligation-- as though Aaron had become the son she always wanted.
This sentence flows very nicely and also makes sense. You can see that the punctuation is proper, the sentence makes sense, and the grammar is correct. With that in mind, that it the correct sentence structure.