Sentence Correction

Never before in the history of music have musical superstars been able to command so extraordinary fees of the kind they do today.
(A) so extraordinary fees of the kind they do today
(B) so extraordinary fees as they are today
(C) such extraordinary fees as they do today
(D) such extraordinary fees of the kind today's have
(E) so extraordinary a fee of the kind they can today


please explain the difference between so and such. Thanks

In this question, such is modifying fees.
Such ....as ... is the correct idiom.
Pay attention to this idiom in questions and be rest assured

Hence C is the correct answer