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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.

C ) A sperm cell

Explanation:

These cells are our sex cells – sperm in males, eggs in females. During meiosis one cell divides twice to form four daughter cells. These four daughter cells only have half the number of chromosomes of the parent cell – they are haploid. Meiosis produces our sex cells