The correct answer is already circled, I just need to show my work. I will gladly give a thumbs up.

18. Which is the most reasonable structure for a compound with this IR spectrum? Why? % Wavelength, (um) 100 2.2 2.4 2.6 3 3,5 4 4,5 5 5,5 6 7 8 9 10 11 1213 14 16 80 n $ 60 m LOCE-CU 40 a 20 1000 800 600 4600 4000 3500 3000 2500 2000 1500 Wavenumber, (cm) (A) o CH3(CH2)4-C=C-COCHz (B) OH CH3(CH2)3-C=C-CHCHZ (C) o H-CC-(CH2)ACCH3 (D) 0 CH3(CH2)4-CH=CH-CH