Question

in comparison to the sun, betelgeuse-
is less bright but hotter
is cooler and brighter

Explanation:

In an H - R (Hertzsprung - Russell) diagram, the vertical axis represents luminosity (brightness) and the horizontal axis represents temperature. Betelgeuse is a red super - giant. Red stars are cooler (lower temperature on the horizontal axis of H - R diagram) compared to the Sun (a yellow - white star). And red super - giants like Betelgeuse are more luminous (higher on the vertical axis of H - R diagram) than the Sun.

Answer:

is cooler and brighter