The sciencee

[heymayank08]

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

what is the problem with option A..

[killer1387]

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

what is the problem with option A..

first of all verb is required to make the construction valid. ........., but........
A has many issues
1. removing the non essential part renders the sentence illogical.
2. Its not an standalone.

I will go with D

[jordan23]

IMO D

In A, look at the sentence construction carefully whenever you encounter "Which" in it. Here The science of economics lacks a verb...and also Which points to Economics..not to the science of economics.

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

what is the problem with option A..

[bittu.0807]

Option A creates a run on sentence.
Sentence starts with The science of economics(SUBJECT), ... but this sentence did not end.
So, This should be a clause.