If You Voluntarily Lift an Object and Have Underestimated Its

If you voluntarily lift an object and have underestimated its weight,

A) the intrafusal muscle fibers shorten at a rate that maintains constant tension on the stretch receptor.
B) the muscle spindle afferents fire a rapid burst of action potentials.
C) α motor neurons fire action potentials but γ motor neurons do not.
D) γ motor neurons fire action potentials but α motor neurons do not.