Which is an organic compound?
a sample b contains cesium and chlorine.
b sample a contains carbon, hydrogen, and oxygen.
c sample c contains hydrogen, oxygen, and phosphorus.

Organic compound, butane Encycopadia Britannica, Inc. Any of a large class of chemical compounds in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or nitrogen. So the answer would be B.) Sample A contains carbon, hydrogen, and oxygen. I hope this helps.