Which of these sentences doesn't make sense?
Options:
- Sentence A: "Butterflies used to be caterpillars"
- Sentence B: "Caterpillars used to be butterflies"

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
Caterpillar is the earlier stage of development in butterflies life. The answer is Sentence B.