A chemistry multiple choice question (I want the answer and analysis ~ thanks in advance here~)

A, wrong. the preparation of Si, a highly polluting traditional industry, uses steps such as high temperature reduction with C, oxidation with Cl2, and reduction with H2

B, correct. The source is SiO2, and sand is available in abundance.

C, wrong. Si and O2 reaction is exothermic, SiO2 decomposition to Si and O2 must be heat-absorbing, so it is not possible to "release energy at the same time."