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 seamlessly connects with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes more sense.

Title: Free Discount. Sentence 1: Jenny purchased a computer in the store. Sentence 2: The cashier scanned the computer. Sentence 3: She told Jenny that she owes $345 dollars. Sentence 4: Jenny gave her a total of $400 dollars in cash. Choices: a. The dog did not howl at all. b. However, The cashier returned $130 dollars.
b