Respuesta :
The answer is A.
The frequency of a wave is how many waves pass a point (measured in this case by how many peaks pass) in an amount of time (in this case 1 second)
The correct answer to the question is : A) The number of peaks passing a point per second.
EXPLANATION:
Generally frequency of a wave means number of waves corresponding to that wave passing through a point in one second.
The number of peaks of a certain wave passing through a point indirectly gives number of waves passing through that point.
Hence, the first statement gives the perfect definition of frequency in terms of peaks.