
Passage: All etching tools are either pinned or flat-edged. However, some flat-edged etching tools are used for carving and some are not. On the other hand, all pinned etching tools are used for carving. As a result, more etching tools are used for carving than those not used for carving.
Question: Which of the following options, if true, can logically infer the conclusion of the above argument?
A. A.Most flat-edged etching tools are not used for carving.
B. B.All etching tools not used for carving are flat-edged.
C. C.There are as many etching tools for pinned as flat-edged ones.
D. D.No etching tool is both a pinned and a flat-edged.
Answer: