The question given below has some statements followed by some conclusions. Taking the given statements to be true even if they seem to be at variance from commonly known facts, read all the conclusions and then decide which of the given conclusion logically follows the given statements.   Statements :  Some boxes are triangles  All spheres are triangles All circles are boxes  All triangles are quadrilaterals Conclusions : 
i) Some quadrilaterals are boxes ii) Some quadrilaterals are triangles iii) Some triangles are spheres  iv) No circle is quadrilateral