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B.) Compound

Explanation:

It's a little hard to read, but it is not a mixture because the components are all bonded. It's not a single atom because there are two hydrogen atoms and one oxygen atom. It's not an element because there is not just one type of atom (there are both hydrogens and oxygen). It can, therefore, only be a compound because it is one structure that is the result of different types of atoms bonding together.

when it is at an intermediate population density