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: Lost Number. Sentence 1: Ana met her high school BFF after eleven years! Sentence 2: She saved his number in her phone right away. Sentence 3: Then, that night, she dropped the phone in her pool! Sentence 4: Luckily, though, the next day her old friend called HER! Choices: a. She decided to be a cowgirl instead. b. She explained what happened-he gave her his number again, laughing!
Output:
b