The Answer Is A. Hope This Helps ;P
There are around 640<span> to </span>850 muscles in human body and they can be categorized in three main groups: <span>skeletal, visceral, and cardiac. </span><span>
The muscles that extend the forearm are located </span>posteriorly. These are the muscles located on the back.
I will be submitting this in a couple minutes and I will let you know what the correct answer was.
Opposable thumb's, primates
