When are collisions involving drowsiness most likely to happen?

Answer: C — Early morning and late afternoon

Collisions involving drowsiness are most likely to happen in the early morning and late afternoon. This is because these are the times when our body's natural circadian rhythm dips, causing a decrease in alertness and drowsiness. While collisions may also occur late at night and just after sunset when it is dark outside, the likelihood is higher during these times due to fatigue. Lunch time, on the other hand, is not typically associated with drowsiness as it falls in the middle of the day when our body is at peak alertness.