Given the task definition and input, reply with output. 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: Raft. Sentence 1: The raft went down the river. Sentence 2: It got stuck on a rock. Sentence 3: The river pulled the raft down into the water. Sentence 4: The boaters jumped out. Choices: a. They never found their raft again. b. Dan was pleased to had won the game for his team.
a