Which statement explains why the methine proton has a higher chemical shift than the methyl proton?

• A. Carbon has a higher atomic mass than hydrogen, so additional carbon atoms increase the deshielding effect felt by hydrogen.
• B. Hyperconjugation between alkyl groups increases the deshielding effect felt by hydrogen.
• C. Alkyl groups act as electron-donating groups, increasing the deshielding effect felt by hydrogen.
• D. Carbon is more electronegative than hydrogen, so additional carbon atoms increase the deshielding effect felt by hydrogen.

Answer: (D)