TOEFL Listening: TPO-TOEFL听力TPO - 045FAJ820SM0H1OQR$

What does the professor imply about ice crystals with a large number of branches? A. They help block harmful radiation from the Sun B. They form as a result of complex reactions with ozone C. They contribute to a reduction in ground-level ozone D. They have a thinner quasi-liquid layer than ice crystals with fewer branches