If the above 2 answers appear inconclusive, I'm afraid that mine may not appear useful either! However, from 30+ years-worth of several autopilots I will hazard a guess based on my understanding of the question (RTFQ). Ultimately your course guides should give you the answer.
Current autopilots probably cover a development range of over 40 years. Later versions do not have, or refer to, direct "pitch control", as such, as this function is incorportated in the "pitch modes" which control vertical profiles. The trimming laws remain similar however.
I suspect that your question refers to one of the earlier systems (still widely in use) whereby the pitch attitude of the aircraft can be adjusted through a switch or wheel on the A/P panel. In this case, and even if done by "pitch mode" systems, causing a pitch change will result in the control column moving accordingly and the trim system adjusting-out any subsequent resudual force (ie: rotating) - but not relevant to Airbus FBW types!
a) would therefore be the correct answer. Hope this helps.