(A) Regarded by opponents as ineffective and meddlesome and by supporters as a conserver of life and energy, the fight over the speed limit continues in our legislatures and on our freeways.
A -> Regarded by X as P and Y as Q, the fight. Which indicates the fight is regarded as P & Q which does not appropriate meaning. Incorrect.
(B) Regarded by opponents as ineffective and meddlesome and by supporters as a conserver of life and energy, the speed limit continues to be fought over in our legislatures and on our freeways.
B -> This corrects error in A but sentence conveys speed limit is being fought. Incorrect
(C) Regarded by opponents as ineffective meddling and by supporters as the conservation of life and energy, the speed limit continues to be fought over in our legislatures and on our freeways.
C- > Refers Speed limit as ineffective meddling and conservation of life. Incorrect
(D) The fight over the speed limit, regarded by opponents as ineffective and meddlesome and by supporters as a conserver of life and energy, continues in our legislatures and on our freeways.
D -> Same as B. Incorrect
(E) The fight over the speed limit, a measure regarded by opponents as ineffective and meddlesome and by supporters as a conserver of life and energy, continues in our legislatures and on our freeways.
E-> a measure regarded by X as P and by Y as Q, properly modifies speed limit. Subject is fight continues in ...
E is correct.