[求助]GWD14-Q21 = GWD-TN1-Q21

Q21:

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.

1. That twenty-one ceramic dog figurines were discovered during the excavating
               
2. Twenty-one ceramic dog figurines discovered at the excavation
               
3. Discovering twenty-one ceramic dog figurines at the excavating
               
4. Ceramic dog figurines, twenty-one of which were discovered during excavating

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

答案是E,我想知道A为什么错呢，That引导一个主语从句，谓语用单数，强调这件事使the number of these artifacts加倍，而E是强调discovery使其加倍，是否改变句子意思了呢？谢谢了