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

follicular phaseovulation phase luteal phase

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.