The demand for airplane mechanics is expected to
grow about ten percent a year in the next decade,
largely because new federal rules calling for major
modifications to older planes and because the air-
lines are adding hundreds of new jets.
(A) new federal rules calling for major modifica-
tions to older planes
(B) new federal rules, which call for major modifi-
cations to older planes
(C) new federal rules call for major modifications
to older planes
(D) major modifications to older planes called for
by new federal rules
(E) major modifications to older planes are called
for according to new federal rules
C sounds right but what about A???
isn't A pretty good between "calling" and "adding" are parallel???
i thought this was a parallel structure question.