Union Official: Several workers who operate a certain type of
machine have developed repetitive-motion injury, which is often
caused by operation poorly designed machinery. Because physiologist
employed by the machine's manufacturer have found that workers who
maintain good posture while using the machine do not risk developing
the condition, the manufacture argues that (the machine's design is
not responsible for the worker's condition). However, when our own
experts (conducted careful trial using both new and experienced
machine operators,) they concluded that the machine's design makes
it difficult for workers to maintain good posture while operation it
over long periods.
In the union official's argument, the two boldface portions play
which of the following roles?
A) The first gives the position that the union official supports; the
second identifies the source of evidence that is offered in support
of the union official's position.
B) The first gives the position that the union official opposes; the
second describes the source of evidence that is offered to undermine
the manufacturer's position.
C) The first gives the position that the union official opposes; the
second identifies the source of evidence that was offered in support
of the manufacturer's position.
D) The first states an intermediate conclusion that is used to
support a further conclusion; the second identifies the source of
additional information that is offered in support of that further
conclusion.
E) The first provides evidence offered in support of the argument's
conclusion; the second identifies the source of some additional
evidence.

I vote for B too.

the same