"Water, soil and waste pipes must not be installed outside of a building, in attics or crawl spaces, concealed in outside walls, or in any other place subjected to freezing temperature unless adequate provision is made to protect such pipes from freezing by insulation or heat or both. Exterior water supply system piping shall be installed not less than 6 inches (152 mm) below the frost line and not less than ______________________ below grade. A. 6 inches (152 mm) B. 12 inches (305 mm) C. 24 inches (608) D. 48 inches (1216 mm)!"

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