Before starting his presentation on the benefits of taxi services, Mark engages the listeners by asking them to imagine themselves driving in a drunken state. He goes on to ask them the possible outcomes that they can imagine. This exercise ensures that Mark gets the listeners' complete attention. In the given scenario, Mark uses $\_\_\_\_\_$ to open his presentation.

A$.$ audience involvement

B$.$ statistics

C$.$ engaging questions

D$.$ a simile