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.

[Q]: Title: Exam. Sentence 1: It was Kia's first year studying French. Sentence 2: She fully expected to fail her exam. Sentence 3: But when she got her paper back, she was surprised. Sentence 4: She had scored a B+ in her French class! Choices: a. Kia was very proud of herself. b. He ended up having to call a plumber to fix the clog.
[A]: a

[Q]: Title: The Math Problem. Sentence 1: The teacher looked out over the class and Joey slid down in his seat. Sentence 2: One finger pointed in his direction and Joey slid from his desk. Sentence 3: He stared up at the jumble of numbers on the chalkboard. Sentence 4: He wrote an answer on the board and hurried to his desk. Choices: a. Many customers were very happy when seeing the product. b. After the teacher said the answer was right, Joey smiled.
[A]: b

[Q]: Title: David's heart attack. Sentence 1: David is a large man. Sentence 2: David does not eat healthy things. Sentence 3: One evening while eating his steak David starts feeling a pain. Sentence 4: He feels a pain in his chest and falls to his knees. Choices: a. David is having a heart attack his wife calls for help. b. Eventually the cancer took his life and rich was gone.
[A]:
a