If an advertiser adds affinity audiences and topics to the same targeting group, a trueview ad will show:
a) only on targeted affinity audiences
b) only when targeted topics and affinity audiences match
c) on targeted topics and affinity audiences
d) only on targeted topics

C) on targeted topics and affinity audiences.

Explanation:

If the advertiser adds affinity topics and audiences to the same group that the advertiser is targeting , the TrueView will show on the targeted topics and affinity audiences.

For ex:-

Google TrueView is constructed on the promise that you have to pay only when someone opts to see your video advertisement.