Final answer:
A molecule of sodium hypochlorite, which is a common form of household bleach, contains three atoms: one sodium, one chlorine, and one oxygen.
Step-by-step explanation:
The question "How many atoms of bleach are there per compound?" is asking about the composition of a common household bleach, which is typically a solution of sodium hypochlorite (NaClO). When considering a molecule of sodium hypochlorite, there is one sodium atom, one chlorine atom, and one oxygen atom. Therefore, there are three atoms in a molecule of sodium hypochlorite. The correct answer to the question would be option B, 3.