(A) In reference to the current hostility toward smoking, smokers frequently expressed anxiety that
(B) Referring to the current hostility toward smoking, smokers frequently expressed anxiety about
(C) When referring to the current hostility toward smoking, smokers frequently express anxiety about
(D) With reference to the current hostility toward smoking, smokers frequently expressed anxiety about
(E) Referring to the current hostility toward smoking, smokers frequently express anxiety that
The answer is E....but..why? why is D wrong? in the original sentence.."reference" is in the noun form..we could change it to verb? isn't it against one of the 16 rules?
