Answer:
(a) = Nitrogenous base (adenine)
(b) = Ribose sugar
(c) = Three phosphate groups
Step-by-step explanation:
The structure depicted is that of ATP (adenosine triphosphate). Structure (a) is adenine, a nitrogenous base, structure (b) is a ribose sugar, and structure (c) is three phosphate groups. These three structures are present in every single ATP molecule.