Meissner Corpuscles Respond Best When the Skin ________; Merkel Discs

Meissner corpuscles respond best when the skin ________; Merkel discs are most active when ________.

A) rubs against another object; something warm touches the skin
B) is touched by something warm; the skin rubs against another object
C) rubs against another object; an object puts steady pressure on the skin
D) senses steady pressure from an object touching the skin; an object rubs against the skin