Methionine is a unique sulfur-containing amino acid that can be used to build proteins and produce molecules in the body.
Given the 3D model below, identify its molecular formula.

Legend: H → white, S → yellow, O → red, N → blue, C → grey

• A. C₄H₈N₂OS
• B. C₅H₁₀N₂OS
• C. C₄H₁₀NO₂S
• D. C₅H₁₁NO₂S

Answer: (D)