The Reason That Vaginal Atrophy Makes Older Women More Susceptible

The reason that vaginal atrophy makes older women more susceptible to STIs is:

A) the vaginal lining is more likely to tear during intercourse.
B) the acidity of the vagina increases and creates a better environment for bacteria to thrive.
C) intercourse tends to last longer, providing more time for transmission to occur.
D) Vaginal atrophy produces all of the above conditions that increase susceptibility to STIs.