B, light if i’m thinking about it right. My bad if it’s wrong, it seems reasonable!
C would be your answer because, it is a nonliving thing. It is not a living chemical or physical factor in the environment. I hope this helped!
<span />
Explanation:
A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds.
Mixture is a combination of different things in which the component elements are individually distinct.
a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.
