I've been having this issue with several quests. I get part way into the quest, and have to choose and option, but there is no choice given to me. CLicking on the question mark does nothing. I did a lot of searching and asking, and found a solution. It is from the EA Forums, and the member who posted this is mzneko-nz. It fixed the problem.....Many thanks to mzneko-nz!!!
Here is what he/she said:
Clear the game caches and try again ....
C:/Documents/Electronic Arts/The Sims Medieval
Delete these 3 cache files:
CASPartCache.package
compositorCache.package
simCompositorCache.package
The game will recreate them when you load it again - remember to let the start go through the cut scene, don't skip it.