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.

Let me give you an example: Title: Marcus Buys Khakis. Sentence 1: Marcus needed clothing for a business casual event. Sentence 2: All of his clothes were either too formal or too casual. Sentence 3: He decided to buy a pair of khakis. Sentence 4: The pair he bought fit him perfectly. Choices: a. Marcus was happy to have the right clothes for the event. b. He left in a huff for having his ideas mocked.
The answer to this example can be: b
Here is why: Marcus is buying clothes for a business event and not presenting an idea.

OK. solve this:
Title: Bad scrape. Sentence 1: One day Tina was hiking. Sentence 2: All the sudden she fell. Sentence 3: She had slipped. Sentence 4: Her knees were scraped. Choices: a. I ended up using half the bottle. b. She had to put stuff on them.
Answer:
a