1.  If at least small and medium-sized hats are known to be in box 4, which of the following must be true?

• A. If box 2 contains only small and medium-sized hats, box 1 does not contain small hats.
• B. If box 2 contains only small and medium-sized hats, box 1 does not contain small hats.
• C. If box 2 contains only small and medium-sized hats, box 1 does not contain small hats.
• D. If box 2 contains only small and medium-sized hats, box 1 does not contain small hats.

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