sanjib wrote:The science of economics, which for four decades was dominated by Keynesians, who at first stressed the government's role in stimulating the economy, but who were ultimately led away from solutions based on government intervention
(A) economics, which for four decades was
(B) economics that was to be
(C) economics, one which has, for four decades, been
(D) economics is one that for four decades has been
(E) economics, for four decades, is one that was
Between B & D which is proper and why?pls Explain

sanjib wrote:The science of economics, which for four decades was dominated by Keynesians, who at first stressed the government's role in stimulating the economy, but who were ultimately led away from solutions based on government intervention

(A) economics, which for four decades was

gives a fragment

(B) economics that was to be

to be is unnecessary

(C) economics, one which has, for four decades, been

gives a fragment

(D) economics is one that for four decades has been

has been - correct verb tense as science dominated for a duration of time - correct


(E) economics, for four decades, is one that was

verb tense error - was


Between B & D which is proper and why?pls Explain