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

A. All squares are quadrilaterals ✅
B. No squares are quadrilaterals
C. Some squares are not quadrilaterals
D. None of these

Explanation

  • This is a valid chain syllogism
  • Squares subset of Rectangles, Rectangles subset of Quadrilaterals
  • Therefore, all squares are quadrilaterals