From the Following Terms, Select the Most Appropriate Term to Fill

From the following terms, select the most appropriate term to fill in the blank. Not all the terms are used.
-?Muscles on the anterior humerus are ______________.

A) gastrocnemius
B) involuntary
C) triceps
D) pronation
E) eversion
F) adduction
G) voluntary
H) quadriceps
I) rotator cuff
J) hamstrings
K) supination
L) extension
M) syndrome
N) sprain
O) biceps
P) deltoid
Q) flexion
R) inversion
S) median
T) diagnosis
U) strain