求助一道填空机经题

In the last two hundreds years, the practice of archaeology has changed greatly, from diggin up ancient artifacts for use by wealthy individuals as art objects to analyzing the detritus of everyday life in the laboratory, and thus from __to data collection.
A. supposition
B theorizing
C. fact-finding
D. treasure hunting
E. scientific discovery

求解为什么单选D不能同时选C, 这不也算fact finding吗？

实验室对应数据收集，艺术展品对应宝物猎寻

digging up ancient artifacts for use by wealthy individuals as art objects 给有钱人的玩物

dig up表明就是寻宝的意思，对应D