Chemical bonding — practice question

The infra-red spectrum of a substance whose empirical formula is $\text{C}_2\text{H}_4\text{O}$ is displayed. Which bonds cause peak X and peak Y?

• Apeak X: C-H, peak Y: C=C
• Bpeak X: C-H, peak Y: C=O
• Cpeak X: O-H, peak Y: C=C
• Dpeak X: O-H, peak Y: C=O