Correct option is (d)
Morphine is an analgesic drug that is used to relieve severe pain. It was first isolated in 1804 by Friedrich Serturner which is generally believed to be the first ever isolation of a natural plant alkaloid in history.
Sodium is an extremely reactive metal and a powerful reducing agent. When exposed to air it very quickly oxidizes. It also reacts violently to water. We store sodium under kerosene because kerosene is already highly reduced and wont react with sodium metal.
Boric acid also called orthoboric acid is a weak acid of boron often used as an antiseptic or insecticide.
Nickel silver also known as German silver is a copper alloy with nickel and often zinc. The usual formulation is 60% copper 20% nickel and 20% zinc.
