a question about SC

justforuUID: 2238767

Never before in the istory of music have musical superstars been able to command so extraordianry fees of the kind they do today.
(a) so extraordianry 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
The key is C.
But I do not know why B is wrong choice. thanks:)

stephanie_sisuUID: 201114

这里前后对应的是musical superstars为主语
如果用are的话容易混淆