For Which Situation Below Is the Mean the Appropriate Measure

For which situation below is the mean the appropriate measure of central tendency?

A) the number of hours completed by college graduates, with categories of 120-129, 130-139, 140-149, 150-159, 160 and over.
B) the birds sighted on the annual Audubon bird count, with categories of blue jay, purple finch, scarlet tanager, crow, etc.
C) reaction time in stepping on the brake of a car when danger looms. This distribution is quite skewed
D) none of the other alternatives are correct.