Thomas Eakins's powerful style and his choices of subject--the advances in modern surgery, the discipline of sport, the strains of individuals in tension with society or even with themselves--was as disturbing to his own time as it is compelling for ours.
(A) was as disturbing to his own time as it is
(B) were as disturbing to his own time as they are
(C) has been as disturbing in his own time as they are
(D) had been as disturbing in his own time as it was