I'm guessing you mean click A, B, or C. If so, then yes, you could do that using InSim buttons. Make a non-clickable button as a label, then create a seperate button for each multiple-choice selection. Either that or use the normal message system and text commands, where each command allows further sub-commands to be chosen.
Or with one button, no labels needed, you could just changed the background color of the button when it is 'checked' and then on submit check the flags for the background colors.