Official Solution:Those who oppose water fluoridation claim that it not only poses serious health risks, especially to children, and also has engendered a number of bioethical dilemmas.A. and also has engendered
B. but also engenders
C. but also engendering
D. but they also engender
E. as well as engendering
The correlative conjunction
not only must be followed by
but also. Therefore,
"as well as engendering" in choice A and choice E, is incorrect.
Furthermore,
has engendered is in the wrong tense.
Items linked in correlative constructions should be grammatically parallel, so
has engendered should be changed so that its tense matches the present tense of
poses.
Choice C contains the participle
engendering, which is not parallel to the main verb
poses.
Answer choice D contains the pronoun
they, which is supposed to refer to
water fluoridation. However, since
water fluoridation is singular and
they is plural, choice D is incorrect.
The correct answer is
B. It uses the correct
not only...
but also construction, and uses the verb
engenders, which is parallel to
poses.
Answer: B