Which of these sentences doesn't make sense?
Options:
- Sentence A: "Yesterday cannot be changed, because it already happened."
- Sentence B: "Tomorrow cannot be changed, because it already happened."

Hmmm, let me think. I want to lay out the solution in details.

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
Tomorrow is the future, and has not happened yet. The answer is Sentence B.