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

The cogeneration plant efficiency nCO if WT, Qi, QH represents turbine

1.	The cogeneration plant efficiency n_CO if W_T, Q_i, Q_H represents turbine work, heat input, heat output respectively is given by?
A.	n<sub>CO</sub> = (W<sub>T</sub> + Q<sub>i</sub>) / Q<sub>H</sub>
B.	n<sub>CO</sub> = (W<sub>T</sub> Q<sub>i</sub>) / Q<sub>H</sub>
C.	n<sub>CO</sub> = (W<sub>T</sub> + Q<sub>H</sub>) / Q<sub>i</sub>
D.	n<sub>CO</sub> = (W<sub>T</sub> + Q<sub>H</sub>) / Q<sub>i</sub>
Answer» E.