Correct option is C
A circumpolar star is a star that never sets below the horizon for a given observer, regardless of the time of night or year.
For such stars, both the upper culmination and lower culmination occur above the horizon, making them visible throughout the night.
Key Explanation:
Upper culmination: The point where the star reaches its highest altitude in the sky.
Lower culmination: The point where the star reaches its lowest altitude. For circumpolar stars, even the lowest altitude remains above the horizon.
