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: A Hot Day. Sentence 1: The couple had just moved from the mid-west to Phoenix. Sentence 2: They decided to go to an outdoor outlet mall. Sentence 3: The temperature was 122 degrees. Sentence 4: After walking to a few stores, they both felt wobbly. Choices: a. She bought a bottle of her favorite. b. The returned to their car and drank a lot of cold water.
b