PT 34 S2 Q25

Although wood-burning stoves are more efficient thanopen fireplaces, they ... ...

Which one of the following, if true, most seriously weakens the argument?
(A) The most efficient wood-burning stoves produce less creosote than do many open fireplaces.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: "Weaker" Questions, Set 3 - Difficult/Uncommon Mix (25Q)