Blood does not enter or leave the ventricles during the period called
a. ejection.
b. rapid filling.
c. atrial systole.
d. isovolumic contraction.
e. active and passive filling.

That would be D. Isovolumic contraction

As the name states during ISOvolumic contraction the volume of the ventricles doesn’t change and stays the same so no blood enters or leaves the ventricles. The thing that changes is the pressure of the ventricles that increases.

I can explain the process more if u want in the comments:)