Archaeologist: There were several porcelain-production

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Archaeologist: There were several porcelain-production centers in 18th-century Britain, among them Bristol, Plymouth, and New Hall. Each center developed a unique recipe for its porcelain that might include flint glass, soapstone, bone ash, clay, quartz, and so on. We will, therefore, be able to determine, on the basis of the compositional analysis, where the next cup we recover from this archaeological site was made.

Indicate two different statements as follows: one statement identifies an assumption required by the archaeologist's argument and the other identifies a possible fact that, if true, would, provide significant logical support for the required assumption.

A: Other cups have been recovered from the archaeological site, all of which were made of porcelain.
B: Some of the cups recovered from the archaeological site were not made of porcelain.
C: The next cup to be recovered from the site will likely be made of porcelain.
D:Porcelain makers often traveled between centers, experimenting with one another's recipes.
E: There was considerable overlap of materials in the recipes used by the various centers.
F: Most porcelain in 18th century Britain was made at one of the several centers.