In this task, you're given five sentences, numbered 1 through 5, and two options a and b for possible titles for the story. Your job is to choose the title that better fits the story. Indicate your choice by 'a' or 'b'.

Sentence 1: I put my dog in training school. Sentence 2: He is learning a lot of new tricks. Sentence 3: He can now sit and stand. Sentence 4: They are very good teachers. Sentence 5: He will be finished in 3 weeks. Choices: a. Working OUt. b. Training school.
b