Two statements are given, followed by three conclusions numbered I, II and III. Assuming the statements to be true even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.
Statements:
Some quadrilaterals are squares.
All squares are rhombuses.
Conclusions:
I. No quadrilateral is a rhombus.
II. All rhombuses are squares.
III. Some quadrilaterals are rhombuses.