A would be the correct answer because but has a comma has it before it.
The correct answer is A. Before she had to go inside and get ready to go to the movies, Marilyn played in the snow for hours with her friends.
The sentence fragment was corrected by placing what Marilyn did after in the first part of the sentence and by using a comma, we could add what Marilyn did before.
Hi how are u? What’s ur fav color? Fav hobby?
