Question

what is the initial stage of all stars?
nebula
black hole
supernova
white dwarf

Explanation:

A nebula is a large cloud of gas and dust in space. Stars form from the gravitational collapse of parts of a nebula. A black hole is the remnant of a massive star's death (in certain cases). A supernova is a violent explosion of a star at the end of its life cycle. A white dwarf is the core left after a low - mass star has shed its outer layers. So, the initial stage of all stars is a nebula.

Answer:

nebula