Let's think step by step! What is the name of the light cycle that plants detect?
Options:
- (A) photons
- (B) three
- (C) Summer
- (D) diurnal
- (E) autumn
- (F) Energy.
- (G) Energy
- (H) sunlight
The thinking starts now:

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
Plants detect and respond to the daily cycle of light and darkness. Diurnal cycles Diurnal cycles are the daily cycles of light and darkness. Plants detect and respond to diurnal cycles. The final answer: (D).