Which of the following best represents a compound?

Iron

Salt

River sediment

Ocean water

The answer to your question is: Salt

Step-by-step explanation:

Element: is a substance that cannot be converted into another substance.

Compound: is a substance that is formed by 2 or more elements.

Mixture: is a substance composed by 2 or more compounds.

Iron it is an element

Salt it is a compound

River sediment it is a mixture

Ocean water it is a mixture