ATP Composition Steps:

• Recall ATP as adenosine triphosphate, consisting of a nitrogenous base, sugar, and phosphate groups.
• Identify key components: adenine (base), ribose (sugar), and three phosphates.
• Match to choices: assume 1 is adenine, 5 is phosphate (common in such questions).
• Verify C selects the base and phosphate, excluding sugar if not listed.

Why C is correct:

• ATP's formula is C₁₀H₁₆N₅O₁₃P₃, combining adenine (1) and triphosphate (5) with ribose implied.

Why the others are wrong:

• A includes extraneous bases like guanine (2) or cytosine (3), not in ATP.
• B adds incorrect sugar like deoxyribose (4) instead of ribose.
• D omits adenine (1), leaving only sugar and phosphate, which forms ADP without base.

Not enough information on exact labels for 1-5. Final answer: C