You will be given a definition of a task first, then some input of the task.
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: Tragic Heat. Sentence 1: On a very hot day, Steve was outside with his dog when his phone rang. Sentence 2: A friend urgently needed him, and Steve jumped in his car to go help. Sentence 3: He texted his wife to let the dog in and spent hours with his friend. Sentence 4: Coming home, he was horrified to see his dog motionless in the dirt. Choices: a. His wife never got the text, and trapped outside, the dog had died. b. But from that day on he called it barfy bear.
Output:
a