[单选题]根据“在前提中不周延的概念，在结论中不得周延”的规则，可推知错误的是_______
A.在结论中不周延的概念，在前提中可以周延
B.在前提中周延的概念，在结论中可以不周延
C.在前提中不周延的概念，在结论中可以周延
D.在前提中不周延的概念，在结论中不得周延

In the two decades between 1929 and 1949, sculpture in the United States sustained what was probably the greatest expansion in sheer technique to occur in many centuries. (46)There was, first of all, the incorporation of welding into sculptural practice, with the result that it was possible to form a new kind of metal object. For sculptors working with metal, earlier restricted to the dense solidity of the bronze cast, it was possible to add a type of work assembled from paper -- thin metal sheets or sinuously curved rods. Sculpture could take the form of a linear, two-dimensional frame and still remain physically self supporting. Along with the innovation of welding came a correlative departure: freestanding sculpture that was shockingly flat.
Yet another technical expansion of the options for sculpture appeared in the guise of motion. (47)The individual parts of a sculpture were no longer understood as necessarily fixed in relation to one another, but could be