You will be given a definition of a task first, then some input of the task.
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: Kitchen towels. Sentence 1: Sarah's kitchen towels were old and filthy. Sentence 2: So she threw her old towels away. Sentence 3: She went to the store to get new ones. Sentence 4: She found some very nice ones and bought them. Choices: a. I saved a lot of money by being thrifty. b. She was happy to have her new kitchen towels.
Output:
a