PT 25 S4 Q24

   Sociologist: Research shows, contrary to popular opinion, ... ...

Which one of the following, if true, most seriously weakens the sociologist’s argument?
(A) Some people who have pets are happier than most people who do not.
(B) ...
(C) ...
(D) ...
(E) ...

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