Steam is to be condensed on the shell side of a 2-shell-passes and 8-tube-passes condenser, with 20 tubes in each pass. Cooling water enters the tubes a rate of 2 kg/s. If the heat transfer area is 14 m² and the overall heat transfer coefficient is 1800 W/m² · K, the effectiveness of this condenser is
(a) 0.70

(b) 0.80

(c) 0.90

(d) 0.95

(e) 1.0