Identify B, X and R respetectivelly in the following sequence of reactions
`C_(2)H_(5)MgBroverset(ClCN)rarrAoverset(H_(3)O^(+))rarrB`,
`CH_(3)COCH_(3)underset(NaOH)overset(I_(2))rarrXoverset(Ag)rarrY`
`C_(6)H_(5)NH_(2)underset(HCl)overset(NaNO_(2))rarrPoverset(CuCN)rarrQoverset(+4H)rarrR`
A. `C_(2)H_(5)COOH, CHI_(3),C_(6)H_(5)CH_(2)NH_(2)`
B. `C_(2)H_(5)COOH, CH_(3)I, C_(6)H_(5)COOH`
C. `C_(2)H_(5)CH_(2)NH_(2), CH_(3I, C_(6)H_(5)COOH`
D. `C_(2)H_(5)COOH, C_(2)H_(5)I, C_(6)H_(5)CONH_(2)``C_(2)H_(5)COOH, C_(2)H_(5)I, C_(6)H_(5)CONH_(2)`
