Final answer:
The Sun remains in the same constellation from sunrise to sunset, so if it rises in Gemini, it will set also in Gemini.
Step-by-step explanation:
When the Sun rises in the constellation Gemini, it remains in the same constellation throughout the day until it sets. The apparent daily motion of the Sun is caused by the Earth's rotation, which carries the Sun across the sky along with the stars. However, during the day, individual stars and constellations are not visible due to the brightness of the Sun. At sunset, the Sun will still be located in the same constellation as at sunrise, which in this scenario is Gemini. Therefore, the correct answer is c. in the constellation Gemini.