Sentence Correction (SC) | The Fribourg Philharmonic orchestra has been an astounding symbol

The Fribourg Philharmonic orchestra has been an astounding symbol of neo-classical music since 1876, and they are still in demand as a superlative group, participating in numerous concerts across Europe and USA.

A. they are still in demand as a superlative group
B. being still in demand as a superlative group
C. they are in demand as a superlative group
D. it is still in demand as a superlative group
E. it are still in demand as being a superlative group