PT 15 S2 Q7

Workers may complain about many things at work, but stress is not high ... ...

Which one of the following, if true, most seriously weakens the argument?
(A) Those workers who are responsible for the planning and supervision of long-term projects are less likely to complain of either boredom or stress.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: "Weaker" Questions, Set 1