This is punctuated correctly.
"Marshmallows are my favorite snack" is a complete sentence unto itself.
The comma instead of a period shows that the sentence spoken is part of the whole sentence, which includes the speaker (she) and a word to describe how the speaker said it (explained).
The correct answer should be C. The smell of bacon and eggs was my alarm clock on cold mornings.
To help you in the future, just remember that figurative language is essentially just a statement that isn't literal. In A and B, both of those things actually happened. However, for C, bacon and eggs didn't start ringing an alarm to wake them up.
The answer is personal and spiritual exploration because romantic literature was meant to make the mind wander into romantic stories of love and romance where one found out more about themselves while falling in love. At least, that is my best guess since it's certainly not supposed to be rational and well reasoned ideas, it's not about religion, and I don't think it's supposed to empasise on society.
If you mean a good critic, no, they won't. The answer is false.