(1)A graph is called vernal equinox because its termination line crosses the pole.

(2) Figure B rotates counterclockwise, which is the northern hemisphere; The arctic circle produces extreme night phenomenon, so it is winter solstice in the northern hemisphere.

(3) Figure C is clockwise, which is the southern hemisphere; The Antarctic circle produces an extreme solar phenomenon, that is, the winter solstice in the northern hemisphere

(4) The D chart is clockwise, and the phenomenon of polar night appears in the southern hemisphere and Antarctic circle, which is the summer solstice in the northern hemisphere.

So the same dates are B and C.

So choose: B.