giải và giải thích vì sao họ em vs 1 April is the month when the weather is usually the hottest . A. April is the month that the weather is usually the hottest. B. April is the month which the weather is usually the hottest. C. April is the month on which the weather is usually the hottest . D. April is the month in which the weather is usually the hottest. 2. People protesting against pollution are marching to New York. A. People they protest against pollution are marching to New York. B. People whom protest against pollution are marching to New York. C. People who protest against pollution are marching to New York. D. People that protesting against pollution are marching to New York