gwd1-q21的疑问

That twenty-one ceramic dog figurines were discovered during the excavating of a 1,000-year-old Hohokam village in Tempe, Arizona, has nearly doubled the number of these artifacts known to exist.

A.      That twenty-one ceramic dog figurines were discovered during the excavating

B.       Twenty-one ceramic dog figurines discovered at the excavation

C.      Discovering twenty-one ceramic dog figurines at the excavating

D.      Ceramic dog figurines, twenty-one of which were discovered during excavating

E      The discovery of twenty-one ceramic dog figurines during the excavation

后面既然是doubled the number，前面怎么能用discovery呢？不过后面是has,用dog figurines做主语也不对哦