Among the solar terms corresponding to the following poems, the day is shorter than the night in most parts of China:

The first step is to examine geographical knowledge.

The second step, China in the northern hemisphere, the variation law of the length of day and night in the northern hemisphere: the days are long and the nights are short in summer (March 2 1-September 23), and the days are short and the nights are long in winter (September 23-March 21day), and the vernal equinox and autumn are equally divided. Item D, "Hard solitary flowers break the slight cold, and the flower heart should be like a guest's sorrow", comes from Mu Furong in front of the window by Fan Chengda, a poet in the Southern Song Dynasty. The "slight cold" in the poem is 23 solar terms, ranging from 65438 to1October 5-7, so the days are short and the nights are long.

Therefore, choose the d option.