Four years ago, Acme Tool and Die included its employees in a profit-sharing plan in which workers started receiving quarterly bonuses based on the company's profits. Since this plan was initiated, worker productivity at the company has nearly doubled. This productivity increase is BEST explained in terms of: classical conditioning spontaneous recovery. operant conditioning. shaping. Feb19 3:05 MFor professional baseball players, swinging at a pitched ball is reinforced with a home run on a schedule. variable-interval fixed-ratio variable-ratio fixed-interval