GWD17-Q20 关于分词修饰的一点问题

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20 GWD17-Q20:

Construction of the Roman Colosseum, which was officially known as the Flavian Amphitheater, began in A.D. 69, during the reign of Vespasian, was completed a decade later, during the reign of Titus, who opened the Colosseum with a one-hundred-day cycle of religious pageants, gladiatorial games, and spectacles.

A. which was officially known as the Flavian Amphitheater, began in A.D. 69, during the reign of Vespasian,

B. officially known as the Flavian Amphitheater, begun in A.D. 69, during the reign of Vespasian, and

C. ！which was officially known as the Flavian Amphitheater, began in A.D. 69, during the reign of Vespasian, and

D. officially known as the Flavian Amphitheater and begun in A.D. 69, during the reign of Vespasian it

E. officially known as the Flavian Amphitheater, which was begun in A.D. 69, during the reign of Vespasian, and

这一题答案选的是C，我想问一下，在B答案中，known as不可以用成分词做定语修饰么？比起C从句不是更简洁么？求大神解答~