the ______ is the time it takes for a wave to complete one cycle.\no trough\no period\no frequency\no hertz

the ______ is the time it takes for a wave to complete one cycle.\no trough\no period\no frequency\no hertz
Answer
Brief Explanations:
The period of a wave is defined as the time taken for one complete cycle. A trough is the lowest - point of a wave, frequency is the number of cycles per unit time, and hertz is the unit of frequency.
Answer:
B. period