China was united under the Qin and Han before Buddhism would have been introduced, united again four centuries later in the Tang Dynasty, a time now regarded as the "golden age" of Chinese Buddhism.

A. was united under the Qin and Han before Buddhism would have been introduced, united

B. had been united under the Qin and Han before Buddhism had been introduced, united

C. had been united under the Qin and Han before Buddhism was introduced, and it was united

D. was united under the Qin and Han before Buddhism had been introduced, and they were united

E. was united under the Qin and Han before Buddhism would have been introduced, and they had been united


OA C

Source: Magoosh