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Algebra Difficulty 3.0 AMC 10/12 Find the answer United Kingdom

Four positive numbers $p, q, r$ and $s$ are in increasing order of size. One of the numbers is to be increased by 1 so that the product of the four new numbers is now as small as possible. Which number should be increased?

(A) $p$ (B) $q$ (C) $r$ (D) $s$ (E) either $q$ or $r$

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