Identify A, B, C and D in the following reaction sequence
A. The compound A is `(CH_(3))_(2) SiCl_(2)`
B. The compound C and D are `SiO_(2)` and `SiC` respectively
C. The compound B is `(CH_(3))_(2) Si (OH)_(2)`
D. The compound B is `(CH_(3))_(2)Si = O`
