You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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: Marcus Buys Khakis. Sentence 1: Marcus needed clothing for a business casual event. Sentence 2: All of his clothes were either too formal or too casual. Sentence 3: He decided to buy a pair of khakis. Sentence 4: The pair he bought fit him perfectly. Choices: a. Marcus was happy to have the right clothes for the event. b. He left in a huff for having his ideas mocked.
Solution: a
Why? Marcus is buying clothes for a business event and not presenting an idea.

New input: Title: New shot. Sentence 1: Tina went to the doctor. Sentence 2: They told her dreaded words. Sentence 3: She needed a shot. Sentence 4: Tina was not happy. Choices: a. But she got it anyway. b. I decided leaving my door open wasn't a good idea anymore.
Solution:
a