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E is the right answer.
This is the case of Idiom, Subject verb agreement.
Since discoveries were made during excavation and not at excavation. So choice B and C are wrong. Choice A is wrong clause 'that...the excavation' is not the right subject for verb has. Choice D is wrong for using 'excavating'.
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
Check out this awesome article about Anderson on Poets Quants, http://poetsandquants.com/2015/01/02/uclas-anderson-school-morphs-into-a-friendly-tech-hub/ . Anderson is a great place! Sorry for the lack of updates recently. I...