Researchers have found that creative expression, when unfettered associatively by production quotas, can help to lower stress and ease anxiety.
A:
B: when unfettered by associated production quotas, perhaps helped
C: when not fettered associatively by production quotas, can help
D: if not fettered associatively by production quotas, helped
E: if not fettered by associated production quotas, can help

First, I don't understand the meaning of the sentence.
What does it mean to say that creative expression is:
(i) "unfettered associatively by production quotas"
(ii) "not fettered associatively by production quotas"
(iii) "not fettered by associated production quotas"

Sorry, I have to bother someone on semantics; sometimes, I get thrown off if
a sentence seems tough to discern.

Thanks.

Source: Grockit.com
OA: E