Which of the following characterizes a functional group?

• A. A functional group is a group of atoms made up of carbon and hydrogen.
• B. A functional group is a group of atoms arranged in the same way but changes from one compound to another.
• C. A functional group is a group of atoms arranged in the same way and consistent from one compound to another.
• D. A functional group is a group of atoms that is shared by all compounds.

Answer: (C)