4. A compound with the molecular formula C₁₀H₁₃Br gave the following ¹H NMR spectrum δ 1.6 (s, 6H), 3.1 (s, 2H), 7.2 (m, 5H). The most likely structure for this compound is (A) C₆H₅CH₂CBr(CH₃)₂ (B) C₆H₅CH₂CH₂CHBrCH₃ (C) C₆H₅C(CH₃)BrCH₂CH₃ (D) C₆H₅CHBrCH(CH₃)₂