Use this fact to answer the question: cycles of day and night occur once per day

Which three events are likely to occur once per day?

Pick your answer from:
[1]. 3 cycles of day, 3 cycles of night, and birds chirping as the sun rises.
[2]. a cycle of day, a cycle of night, and a motorcycle.
[3]. a cycle of day, a cycle of night, and birds chirping as the sun rises.
[4]. a cycle of day, a cycle of night, and birds flying.

The answer is:
[3].