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: The Truck. Sentence 1: Ava heard something rumbling outside her house. Sentence 2: She peeked outside and saw a big pickup truck. Sentence 3: She watched as it crept down the street. Sentence 4: She called the police and reported the suspicious truck. Choices: a. They said they would keep an eye out for it. b. Ingrid was so happy that she could now give to others.
a