If what you want is a numbered list of questions with multiple choice answers, then you need to use a multilevel list. For the basics of multilevel lists, see
http://www.shaunakelly.com/word/numbering/numbering20072010.html.
Instead of linking your list levels to headings, however, you may want to use List Number and List Number 2, linked to Levels 1 and 2 of your multilevel list. Select 1, 2, 3 numbering for Level 1 and a, b, c numbering for Level 2, with an appropriate indent.
The numbering for Level 2 will automatically restart after each Level 1 paragraph.
To facilitate typing a large number of such question-and-answer groups, you may want to make List Number 2 the "Style for following paragraph" of the List Number style and assign a keyboard shortcut to the List Number style for easy return. But of course
you can also use the built-in keyboard shortcuts for promoting/demoting list levels.
