C large, local supplies of food and intersecting highways D urge, local supplies of akind labor and seaports X urge, local supplies of educated workers and university growth poles Answer D Incorrect Skilled Labor is needed for steel production but is not a physical attribute of the site of a place. A seaport is a physical attribute of site, but neither the Ruhr Valley nor Pittsburgh is located on or near a seaport. Thus, the answer does not align with the question asked regarding the site for the Ruhr Valley