Answer:
Step-by-step explanation:
To determine the type of star based on its absolute magnitude and surface temperature, we need to refer to the Hertzsprung-Russell (HR) diagram.
A star with an absolute magnitude of 10 would be a relatively dim star, as absolute magnitude refers to the brightness of a star if it were located at a distance of 10 parsecs away from us.
On the HR diagram, a star with a surface temperature of 20,000 K would fall in the upper-left region of the diagram, indicating that it is a hot star.
Given that the star is relatively dim with an absolute magnitude of 10, it is likely a white dwarf. Therefore, the correct answer is c. white dwarf.