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: Jack was building a sand castle with turrets, a drawbridge, and moat. Sentence 2: He used ocean water to fill the moat and at that moment a wave hit. Sentence 3: He laid on his side propping up his head with his elbow. Sentence 4: The water started crashing around him but missed the castle. Sentence 5: When he got up, he looked down to see his little brother stomping it. Choices: a. The Date. b. Sand Castle.
b