Fez loves team sports and gets abundant exercise through team activities. When Fez engages in team activities such as running or passing the ball, what is happening to Fez’s muscles?
A.
They are not stretching, bending, shortening, or lengthening.

B.
They are maintaining tension with an equal force on all sides.

C.
They are lengthening to resist a greater force.

D.
They are producing enough force to lift large weights.