Ared dwarf is the remains of a supernova a hot pulsar a white dwarfs that has cooled a small main sequence star a protostar'

The correct answer to the question above is a  protostar. A red dwarf is a protostar. A red dwarf is this small and cool star that is far from the Earth. It is mainly a common star in the Milky Way (at least near in the Sun.) Due to its luminous light, other red dwarf stars may not be seen as clear as others.

D. a mountain abd are made by volcanos and tectonic plates