The solar terms in the northern hemisphere on the Tropic of Cancer are () A. Equinox B. Winter solstice C. Summer solstice D. Autumn equinox

A, on the day of the vernal equinox, the sun shines directly at the equator, which does not conform to the meaning of the question;

B, from winter to the sun, the sun shines directly on the Tropic of Cancer, which does not meet the meaning of the question;

C. From summer to the sun, the sun shines directly on the Tropic of Cancer, so it is correct;

On the day of the autumnal equinox, the sun shone directly at the equator, which did not meet the question.

So choose: C.