As Part of a Psychology Experiment, You Have a Friend

As part of a psychology experiment, you have a friend apply two pencil points to your skin with varying distances between them.Without looking, you respond "one" or "two" each time with your friend recording the distance between the pencils each time.Your experiment was conducted to determine

A) the extent of your kinesthetic sense.
B) the minimum and maximum level of your vestibular sense.
C) the density of touch receptors on various body areas.
D) the most effective placement for acupuncture needles to be placed.