Question

which star would be very dim and red in color? * the hertzsprung - russell diagram average surface temperature (°c) increasing aldebaran betelgeuse bernards star mira

Explanation:

On the Hertzsprung - Russell Diagram, cooler stars are redder and less luminous stars are dimmer. Bernard's star is a red dwarf star, which is very dim and red in color. Aldebaran and Betelgeuse are red giants and Mira is a red giant variable star, all of which are more luminous compared to a red - dwarf like Bernard's star.

Answer:

C. Bernard's star