Shell Molding Is Best Described by Which One of the Following

Multiple Choice

Shell molding is best described by which one of the following:

A) casting operation in which the molten metal has been poured out after a thin shell has been solidified in the mold
B) casting process in which the mold is a thin shell of sand bonded by a thermosetting resin
C) sand-casting operation in which the pattern is a shell rather than a solid form
D) casting operation used to make artificial sea shells