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'.

Let me give you an example: Sentence 1: Marcus needed clothing for a business casual event. Sentence 2: All of his clothes were either too formal or too casual. Sentence 3: He decided to buy a pair of khakis. Sentence 4: The pair he bought fit him perfectly. Sentence 5: Marcus was happy to have the right clothes for the event. Choices: a. Marcus Buys Khakis. b. Marcus Works.
The answer to this example can be: a
Here is why: Marcus's reasons for buying khakis is established, followed by his purchase of them and reaction.

OK. solve this:
Sentence 1: Kris had always been a good swimmer. Sentence 2: He joined a club to improve his skills. Sentence 3: They invited him to swim in a competition just after joining. Sentence 4: Kris was very nervous about this as he had never swam a race. Sentence 5: He came in second and was very proud of his achievement. Choices: a. The Swimming Competition. b. Rugby League.
Answer:
a