The correct answer is (c) Betelgeuse.
Betelgeuse is a red supergiant star in the constellation Orion. It is one of the most luminous stars in the night sky and is visible to the naked eye. Betelgeuse is a variable star, meaning that its brightness changes over time. It is currently in a period of decline, and its brightness has decreased by about 25% in the past few years.
In 2022, the Hubble Space Telescope captured the first-ever detailed image of the surface of Betelgeuse. The image shows that Betelgeuse is a very complex star, with a turbulent atmosphere and a number of large starspots.
The other options are incorrect. Virgo is a constellation in the northern sky. 70 Virgins is a star in the constellation Virgo. The Big Dipper is an asterism in the constellation Ursa Major.