The Summer Solstice Position Coordinates Are RA = 6^h 0^m

The summer solstice position coordinates are RA = 6^h 0^m 0^s, declination = +23° 27´. What are the coordinates of the winter solstice?

A) RA = 18^h 0^m 0^s, declination = +23° 27´
B) RA = 0^h 0^m 0^s, declination = 0° 0', by definition
C) RA = 12^h 0^m 0^s, declination = -23° 27´
D) RA = 18^h 0^m 0^s, declination = -23° 27´