Answer:
Option B is having lowest frequency
Step-by-step explanation:
Frequency of waves is defined as the number of cycles or number of waves per second.
So here as we can see the repetition or number of cycles is more then it is showing more frequency.
So here maximum frequency is for option c)
Similarly if the number of cycles or repetition is minimum then it will have least frequency in it.
So here minimum frequency in given all figures is for option B)