pradeepkaushal9518 wrote:In reference to the current popularity of electronic mail, postal services frequently expressed anxiety that their prospects for remaining profitable are being limited by their antiquated business model.

A In reference to the current popularity of electronic mail, postal services frequently expressed anxiety that
B Referring to the current popularity of electronic mail, postal services frequently expressed anxiety about
C When referring to the current popularity of electronic mail, postal services frequently express anxiety about
D With reference to the current popularity of electronic mail, postal services frequently expressed anxiety about
E Referring to the current popularity of electronic mail, postal services frequently express anxiety that

Should be E....

You are right Kapur.arnav.

Answer should be E.

Since the sentence say "In reference to the current popularity of electronic mail".The tense in entire sentence should a present one unless required.

A) wrong tense expressed
B) again wrong tense
C) This sentence changes the meaning of original sentence. This sentence means-whenever the postal services refer to current popularity of e-mail these services express anxiety.

The original sentence means to say that - these postal services cite the current popularity of e-mail for their anxiety.In other words in the original sentence there is a causation.The postal services believe that popularity of e-mail is causing their anxiety.

This sentence indicates this situation as a general occurrence.

For eg When I eat,you sleep. [ this indicates two random events occurring at same time]

D) wrong tense. The postal services don't do anything with reference of current email popularity-wrong modifier.

E) This correct.This sentence keeps the original meaning and uses correct tense express.