With Regard to the "Good Jobs- Bad Jobs" Debate,why Is

With regard to the "good jobs- bad jobs" debate,why is the categorization of manufacturing jobs as "good jobs" and service- sector jobs as "bad jobs" not necessarily accurate?

A) Because all manufacturing jobs have experienced declines in productivity over the past two decades and an associated increase in wages.
B) Because all service- sector jobs are preferable to manufacturing jobs.
C) Because all service- sector jobs have experienced large gains in productivity over the past two decades and an associated rise in wages.
D) Because many service- sector jobs require highly skilled workers and are highly paid.
E) Because all manufacturing jobs have experienced a decline in real wages over the past two decades.