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'.
Q: Sentence 1: Some friends and I went to a space museum. Sentence 2: One of the rides was a centrifuge. Sentence 3: They increased the gravity using centripetal force. Sentence 4: The gravity got to four times as strong. Sentence 5: Moving around was much harder. Choices: a. Don't eat the cookie. b. Centrifuge Ride.
A:
b