In this task, you're given four sentences of a story written in natural language. The given story is not complete and your job is to complete the story by selecting one of the sentence choices from (A) and (B), such that the story sounds fully coherent.

Sentence1: Erica had to decide whether to take her final or go help friends. Sentence2: School was important to her, but her friend was in an emergency. Sentence3: Erica told her professor her situation. Sentence4: The professor said she could make up the final at a later date. 
 (A) Erica told her professor that she was being unfair. (B) Erica was so grateful that her professor was understanding.
B