Which of the following is a massive star that has reached the end of its stellar evolution?

Neutron star
Red giant
Stellar nebula
White dwarf

http://en.wikipedia.org/wiki/Stellar_evolution

im leaning towards a am i right

I agree.

The correct answer is a "White dwarf".

To understand why a white dwarf is the correct choice, let's first understand what each option represents:

1. Neutron star: A neutron star is a small and extremely dense remnant of a massive star that has undergone a supernova explosion. Neutron stars are formed by the collapse of the core of a massive star, and they are not at the end of their stellar evolution.

2. Red giant: A red giant is a late-stage, evolving star that has exhausted its nuclear fuel in its core. It goes through a phase where it expands and becomes larger and redder before ultimately shedding its outer layers to become a white dwarf or collapse further to become a neutron star or a black hole.

3. Stellar nebula: A stellar nebula, also known as an interstellar cloud, is a vast region of gas and dust in space from which stars are formed. It is not a star at the end of its stellar evolution.

4. White dwarf: A white dwarf is the final stage of evolution for a small to medium-sized star. After a star runs out of fuel and its outer layers are expelled, the remaining core collapses under gravity to become a white dwarf. It is a hot, dense, and Earth-sized object that slowly cools down over billions of years.

In this case, a white dwarf is the only option that represents a star that has reached the end of its stellar evolution. Therefore, the correct choice is a "White dwarf".