All rectangles are rhombuses. All rhombuses are parallelograms. So, all rectangles are parallelograms.
A) Valid and sound
B) Valid and unsound
C) Invalid

Question

Quizplus · Accepted Answer

The argument is valid because the conclusion logically follows from the premises. It is sound because the premises are true: all rectangles are indeed parallelograms, as both rectangles and parallelograms have opposite sides parallel and equal in length.

All Rectangles Are Rhombuses