Donizetti's Gemma di Vergy, as well as many other bel canto operas of the first half of the 19th century, is infrequently produced today, mostly on account of requiring singers with a virtuosic vocal ability in all of the roles.
A. on account of requiring singersB. on account of their requiring a singerC. because it requires singersD. because of it requiring singersE. being that it requires a singer

Explanation:

Donizetti's Gemma di Vergy, as well as many other belcanto operas of the first half of the 19th century, is infrequently produced today, mostly on account of requiring singers with a virtuosic vocal ability in all of the roles.

A.on account of requiring singers

B.on account of their requiring a singer

C.because it requires singers

D.because of it requiring singers

E.being that it requires a singer

The use of "on account of" with a gerund ("requiring") is wordy and unidiomatic.Option C conveys the meaning in the simplest form and hence is the correct option. All other options are awkwardly wordy.

the emperor is made to look inferior next to faustus's power.

honestly, is this even a but since you asked, he's probably at the store trying to get you food.