15. Oxygen which is a flammable gas bonded with two atoms of hydrogen which is an explosive gas produce water, a colorless, odorless and tasteless liquid that we drink and use for cleaning. Which of the following best explains this property of a compound like water?

A. Compound is composed of two or more elements combined chemically.

B. Compound has totally different properties from its constituent elements.

C. Compound just like elements are important to our environment and living things.

D. Compound can be broken down into simpler substances by using chemical means. ​