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 does not connect with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes less sense.

Title: skip breaks his leg. Sentence 1: Skip is skiing. Sentence 2: Skip falls off his skis. Sentence 3: He lands on top of a rock. Sentence 4: Skip cannot get up. Choices: a. The phone died shortly after. b. Skip has broken his leg skiing.
a