In this task, you're given the title of a five-sentence story, the first four sentences, and two options for the fifth sentence as a and b. Your job is to pick the sentence option that seamlessly connects with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes more sense.

Title: The Big Test. Sentence 1: Jenny knew that the midterm was only a week away. Sentence 2: She had not done very well in class, but was determined to do better. Sentence 3: She study relentlessly. Sentence 4: The day of the big test came. Choices: a. She worked through it all carefully and knew that she aced it. b. The pool had to be re-dug correctly.
a