Empirical formulas require calculating relative formula mass using atomic masses Steps:

• Assign atomic masses: C = 12, H = 1.
• Calculate for A: CH₄ = 12 + 4(1) = 16.
• Calculate for B: CH₂ = 12 + 2(1) = 14.
• Calculate for C: CH₃ = 12 + 3(1) = 15.
• Calculate for D: CH = 12 + 1 = 13. Not enough information: Question ambiguously refers to "compound" without specifying if choices are molecular or empirical formulas, or what "relative" modifies; standard calculation shows A has greatest mass (16), not B.

Final answer: Not enough information.