With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Heavy water has the characteristic blue color of light water; this is because the molecular vibration harmonics, which in light water cause weak absorption in the red part of the visible spectrum, are shifted into the infrared and this causes heavy water to absorb less red light.
text_B: Does the color of heavy water depend on molecular vibrations taking place?
YES.