With no explanation, chose the best option from "A" or "B". Sandy was in a class with her best friend, Amy, and they studied together every night. Sandy wanted to be at the top in her class.

A: When Amy almost failed her final text, Sandy was happy because Amy would not be a threat to her being the top student.
B: Sandy offered to help Amy study harder for the test so Amy wouldn’t fail, for which Amy was very grateful.
B.