B.i'm not afraid of being smashed to pieces. If I want to remain innocent in the world, the decomposition of calcium carbonate and the reaction between CaO and water have no change in the valence of elements, so it is not a redox reaction, so I choose B;
C. When the candle burns, the silkworm will weave until it dies in spring. Every night, the candle will drain the wick, which is a redox reaction, so C is not selected;
D. Except for firecrackers, one year, the spring breeze warmed Tu Su, and the gunpowder explosion was a redox reaction, so D was not chosen;
So choose B.