The two solar terms with the shortest day length

A point that is not on the equator can have the same day and the same long time in a year, and it can only be realized if the direct point of the sun is at the same latitude. Two symmetrical dates about June 22nd (or 65438+February 22nd) are two symmetrical solar terms about summer solstice (or winter solstice). Among the options, only Xiaoman and Dashu are symmetrical about the summer solstice, which meets the conditions. Option D is correct.

So choose D.