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: The Toast that Couldn't Make It. Sentence 1: Randy tried to use the toaster for the first time. Sentence 2: He placed one slice of bread in the small slot. Sentence 3: While the bread was heating, the temperature was on high. Sentence 4: Unfortunately, Randy didn't notice this. Choices: a. The teacher told him to throw it away and gave him a new packet. b. The toast turned to a crisp a few minutes later.
a