Which of the following is the phase of the ovarian cycle during which several primary follicles mature into secondary follicles?
a. luteal phase
b. ovarian phase
c. menstrual phase
d. follicular phase

d. follicular phase is the correct answer.

Explanation:

follicular phase : is the phase of the ovarian cycle during which several primary follicles mature into secondary follicles.

The follicular phase during this phase ovary gets mature and make one of them release during ovulation.

The follicular phase starts with the first day of a period and it gets to end with ovulation.

The ovarian cycle includes maturation of the oocyte, rupture of a follicle, development of the corpus luteum and discharge of ovum.

The ovarian cycle consists of three-phase