RTFQ
The answer is a.
(With the notable exception of airbus FBW aircraft) The engagement of the a/p pitch channel will cause the control column to move in response to pitch commands. The automatic trim system will then operate (a better word than rotate) to reduce the standing load on the elevator.
On smaller a/c the trim system will operate a tab which will move so as to reduce to zero the elevator servo current (i.e servo current = out of trim situation, trim operates 'til current = zero, a/c in trim)
On larger a/c the trim system operates the horizontal stab to restore the elevator back to neutral as sensed by position sensors and a neutral shift system.
hope this helps.
P.S. you should have notes that explain this!