The given molecule shows two absorption peaks, each at 1760 cm−1 and 1810 cm−1. The peaks are due to the _____.
A) symmetric and unsymmetric bending vibrations of the entire anhydride group
B) symmetric stretching vibration of only one carbonyl group
C) unsymmetric stretching vibrations of the carbonyl groups
D) symmetric and unsymmetric stretching vibrations of the entire anhydride group
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