The stability of carbanions in the following
(i) `RC-=overset(-)overset(..)C` , (ii)
(iii) `R_(2)C=overset(-)overset(..)CH` , (iv) `R_(3)C-overset(-)overset(..)CH_(2)`
is in the order
A. `(iv)gt(ii)gt(iii)gt(i)`
B. `(i)gt(iii)gt(ii)gt(iv)`
C. `(i)gt(ii)gt(iii)gt(iv)`
D. `(ii)gt(iii)gt(iv)gt(i).`