This is a physics question, not biology, but...
f=1/T where f is frequency and T is the period.
f= 1/(1/3)=3
frequency =3 Hz
B testis, this is were the sperm is produced
A reason to theory should support the theory , and it can be testified also, otherwise it will not be considered as scientific theory.
So according to above explanation
<span>C. testable . . . supported is the correct answer.</span>
