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答案：C
解析：
If Alan's package weighs p pounds and costs d dollars to ship, then 6 is less than or equal to p is less than or equal to 10. Subtracting 8 across these inequalities gives the equivalent (6-8) is less than or equal to (p-8) is less than or equal to (10-8), and so (-2) is less than or equal to (p-8) is less than or equal to 2. By the definition of absolute value, it follows that |p-8| is less than or equal to 2 must be true.
