A sign that we may be drowsy behind the wheel is given by: Option C. Unhappiness
What is the feeling of drowsyness like?
Drowsiness includes symptoms like sleepiness, energyless to stay active, sort of uninterested, and non-presence of happiness.
Thus, a sign that we may be drowsy behind the wheel is given by: Option C. Unhappiness (which shows lack of happiness).
Learn more about drowsiness here:
https://brainly.com/question/436698
