Cari has just been tested for skin sensitivity. The two legs of a caliper were spread apart

and touched on various parts of her body.

The distances at which she could experience
two different sensations from the points were as follows: back of calf - 1 inch; back of
thigh - 1.25 inches; lower back - 1.44 inches; middle of back - 1.63 inches; and upper
back - 1.75 inches. Which part of Cari's body is the MOST sensitive to touch?
a. Calf
b. Thigh
c. Lower back
d. Middle back
e. Upper back

a. Calf