What contains a ball to help it work efficiently?
Options:
- football field
- bearing
- gymnasium
- playground
- pool table
Let's think now! Step-by-step reasoning:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Bearing means to carry or provide support. A ball works efficiently when provided support.
So, the final answer is bearing.