Hiking in the Woods, You Keep Swatting at the Irritating

Hiking in the woods, you keep swatting at the irritating mosquitoes that land on your face. Later, you're surprised to discover a number of itchy mosquito bites on the backs of your legs. The reason you noticed the mosquitoes landing on yourface but did not notice the mosquitoes landing on your legs is probably because:

A) there are more sensory receptors in your facial skin than in the skin on the backs of your legs.
B) you were able to hear the mosquitoes buzzing near your face but not those that landed on your legs.
C) there are no Pacinian corpuscles in the skin on your legs.
D) heat from your leg muscles masked the sensation of biting mosquitoes.