hard · LSAT Logical Reasoning
No ceramic vessel made with temper X survived firing unless its wall was at least eight millimeters thick. Some vessels from Kiln 4 made with temper X survived firing. Every surviving Kiln 4 vessel with walls at least eight millimeters thick bears either a spiral mark or a maker's stamp. None bears both.
The statements above, if true, most strongly support which one of the following?
- At least one surviving temper-X vessel from Kiln 4 bears a spiral mark rather than a maker's stamp.
- Temper X itself caused the surviving Kiln 4 vessels to develop walls at least eight millimeters thick.
- Some thick-walled Kiln 4 vessel bearing a maker's stamp was made with temper X.
- At least one surviving Kiln 4 vessel made with temper X bears exactly one of the two identifying marks.
- Every surviving Kiln 4 vessel bearing exactly one identifying mark has walls at least eight millimeters thick.
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