What type(s) of atoms make up the element carbon?
a. carbon only
b. oxygen only
c. carbon and oxygen

Solids, liquids, gases - all matter - are made up of atoms (or other things, like molecules, that are made from atoms)! ELEMENTS are the kinds of atoms that we can have. Carbon is an element, hydrogen is an element, and so is oxygen.

so it is c hope this helps

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up