Monique and Hassan Purchase an Over-The-Counter Test Kit to Determine

Monique and Hassan purchase an over-the-counter test kit to determine when she is ovulating. This is accomplished by Monique measuring ____ with the test kit.

A) the level of LH (luteinizing hormone) in her urine prior to ovulation
B) the level of acidity in her vaginal secretions prior to ovulation
C) the level of follicle-stimulating hormone produced by her ovaries
D) her basal body temperature