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 metric system. Sentence 1: It seems that the USA is the only nation not using the metric system. Sentence 2: When I went to South Africa, I wanted to make brownies. Sentence 3: All of the ingredients I bought were in grams so I was confused. Sentence 4: I tried my best to make good brownies with the weird measurements. Choices: a. They turned about bad and I decided I need to learn the metric system! b. Cheerleading made her very tired!
b