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3. The number of obtuse angles in a heptagon with all interior angles less than 180 degrees is at least ( ).
(A) 6
(B) 5
(C) 4
(D) 3

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Official solution

$\mathrm{C}$

Source: NuminaMath-1.5, licensed Apache-2.0. Statement and solution reproduced as published; topic, difficulty and ordering added by this site.