Arbor is not a foundry tool.

Riddle :A riddle is used for clearing the moulding sand. It removes the unwanted material like metal scrap, iron and other metal parts etc.

Arbor :It is a shaft on which machining tool is mounted.

Example : Milling machine.

Slick :It is used to mark or repair corners in a mould.

Trowel :Trowel tool is used to shape and smoothen the surfaces of the mould and for doing small repairs. They are made of steel and are relatively long and narrow.

Hence, the correct option is (B).