The pass rate for driving tests varies according to the time of day.
Which one of the following, on its own, could not be the reason for this variation?
A. Driving in heavy traffic is more difficult, and there’s more traffic at some times of day than
others
B. Examiners are more generous after lunch
C. More tests are taken in the morning than in the afternoon
D. Those who book as soon as they can are not as good as those with more experience, and
they are allocated earlier times in the day
please provide explanation. the answer is c but i need an explanation