When a slice of pizza at the student union sold for $2, Moe did not purchase any. When the price fell to $1.75, Moe purchased a slice each day for lunch. Moe’s reservation price for a slice of pizza must be:
A.less than $1.75.
B.at least $1.75 but less than $2.
C.exactly $2.00.
D.exactly $1.75.
正确答案：at least $1.75 but less than $2.
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