Definition: 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.
Input: Title: Kindergarten Graduation. Sentence 1: The students lined up in their graduation caps. Sentence 2: They entered the gym as Pomp and Circumstance played. Sentence 3: They assembled in a line beside the stage. Sentence 4: The principal called out the students' names. Choices: a. Each child received their diploma and shook the principal's hand. b. So he created a password to only let his friends in.
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
a