Concept:A second-class lever has the load between the effort and the fulcrum.Explanation:In a bottle top opener, the fulcrum is at the edge of the cap, the load is the cap itself, and the effort is applied at the handle.Since the load lies between the effort and the fulcrum, it acts as a second-class lever.Claw hammer is a first-class lever, fishing rod is a third-class lever, and pliers are first-class levers.Answer:A. Bottle top opener