Which combination is an element? how do you know?

A compound is a substance formed when two or more elements are chemically joined. Water, salt, and sugar are examples of compounds. When the elements are joined, the atoms lose their individual properties and have different properties from the elements they are composed of.

HOPE THIS HELPED X

the answer is A

Explanation: well if we take a look at the question and think about what it is talking about we can see that answer b has absolutely nothing to do with the question that is being asked, answer c is literally the exact same as B just a different creature and body of water, d is just wrong