Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Title: The plan.. Sentence 1: Katie's birthday was coming up. Sentence 2: Her best friend wanted to surprise her with a party. Sentence 3: She got together with Katie's friends and family and made a plan. Sentence 4: They decided to have Katie go to the store while they set up the party. Choices: a. The man was happy with his purchase. b. They set up the party and surprised Katie when she came back.
Student:
b