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All squares are rectangles. All rectangles are quadrilaterals. Which conclusion definitely follows?

A. No squares are quadrilaterals
B. Some quadrilaterals are not squares only
C. All quadrilaterals are squares
D. All squares are quadrilaterals ✅

Explanation

  • All A are B, All B are C => All A are C
  • Squares -> Rectangles -> Quadrilaterals