The cloud of interstellar dust and gas that forms a star is known as a

a. white dwarf.
b. protostar.
c. nebula.
d. red giant.

The correct answer is C. The cloud of interstellar dust and gas that forms a star is known as a nebula.

Explanation:

A nebula is a section of the interstellar medium that stands out for its radiation or absorption of radiation against the general background of the sky. Previously, any extended object motionless in the sky was called nebulae. In the 1920s, it turned out that there are many galaxies among nebulae (for example, the Andromeda Nebula). After that, the term "nebula" began to be understood more narrowly, in the above sense. Nebulae are made up of dust, gas and plasma.

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.

the exclusive possession or control of the supply or trade in a commodity or service.