The reaction of following with H₃N₃B₃Cl₃(A) within LiBH₄ in tetrahydrofuran gives inorganic benzene (B), Then (A) reacts with (C) forming H₃N₃B₃(Me)₃. Compounds (B) and (C) are

A. Borazine and MeBr
B. Boron nitride and MeBr
C. Borazine and MeMgBr
D. Diborane and MeMgBr