Covalent compounds occur

C only between nonmetals

Explanation:

Nonmetals form covalent bonds by sharing electrons. In the human body, most bonds are covalent, and the body is made up mostly of carbon, hydrogen, oxygen, you get the idea... which are all nonmetals!

Why not A: Noble gases don’t bond, except in rare cases.

Why not B: Metal-nonmetal bonding is called an ionic bond, because electrons are transferred between ions.

Why not D: Metals usually don’t bond to each other, and this isn’t covalent because they don’t share electrons.

regents of the university of california v. bakke, 438 u.s. 265 (1978), was a landmark decision by the supreme court of the united states. it upheld affirmative action, allowing race to be one of several factors in college admission policy.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this