Salt water is which type of substance?

a. solution

b. molecule

c. compound

d. pure substance

a. solution

Explanation:

A solution is a mixture which contains two or more than two types of components and they can be separated by physical means as well.Example: salt water

Molecule of an element is defined as the aggregate of atoms of similar elements. Example: . Molecule of a compound is the aggregate of atoms of different elements in a fixed ratio by mass. Example:

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example:

A pure substance is a substance which contains definite composition of only one type of component. Hence, it cannot be separated by physical means. Example: Helium, water

answer; natural resources;

the answer is option a.