The concept of clear ice is:

A、 "Clear ice is a kind of smooth and transparent ice formed by relatively slow freezing of supercooled water droplets. The terms" bright ice "and" glaze "are essentially one type of ice";
B、"This type of ice is thicker, harder and sometimes more transparent than rime. With the increase of accumulation, clear ice may form a" trumpet shape ";
C、"The temperature is close to the freezing point. A large amount of liquid water, high flight speed and large water droplets all contribute to the formation of clear ice."