nayana-c1.867c992ae9100904cc61c84591adf0f8f863e0387e30f0d0dbc86640e9f50a1a.en.train.123327

The task

Which of the following statements is true regarding the vibrational spectra of water clusters? A. When the cluster size increases, all vibrational bands shift to red. B. When the cluster size increases, the librational peaks shift to blue while the intramolecular bonded OH stretching bands shift to red. C. When the cluster size increases, the vibrational spectra remain unchanged. D. When the cluster size increases, the free OH stretching modes shift significantly. Return only the single uppercase letter of the correct option.