The figure shows a heat engine (HE) working between two reservoirs. The amount of heat (Q2) rejected by the heat engine is drawn by a heat pump (HP). The heat pump receives the entire work output (W) of the heat engine. If temperatures, T1 > T3 > T2, then the relation between the efficiency (η) of the heat engine and the coefficient of performance (COP) of the heat pump is

• A. COP = η
• B. COP = 1 + η
• C. COP = η-1
• D. COP = η -1 – 1