In foundry work, a riser is which one of the following: a. vertical channel into which molten metal is poured into the mold b. choking mechanism at the bottom into the mold C. foundryman who moves the...

Extracted text: In foundry work, a riser is which one of the following: a. vertical channel into which molten metal is poured into the mold b. choking mechanism at the bottom into the mold C. foundryman who moves the molten metal to the mold O d. reservoirs of molten metal to supply any molten metal to prevent porosity e. channel in the mold leading from the downsprue to the main mold cavity