The cogeneration plant efficiency nco if WT, Qi, QH represents turbine work, heat input, heat output respectively is given by?

• A. nCO = (WT + Qi) / QH
• B. nCO = (WT – Qi) / QH
• C. nCO = (WT + QH) / Qi
• D. nCO = (WT + QH) / Qi