Explanation:

- The idiom "To get the ball rolling" means to start or initiate a process. It originates from the idea of a ball beginning to move, setting things in motion.

- Correct Answer: Option 2, To begin a process

- Option 1: To play a ball game well – This is a literal interpretation referring to sports, unrelated to the idiom.

- Option 3: To match an opponent – This suggests competition but doesn’t capture the essence of starting something.

- Option 4: To keep working until late – This speaks about working long hours, not about starting a process.