Equivalent evaporation of water is the evaporation "for a feed water supply at 100°C

(a)    and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2
(b)    and its corresponding conversion into dry steam at desired boiler pressure
(c)    conversion into steam at atmospheric condition
(d)    conversion into steam at the same pres-sure at which feed water is supplied 
(e)    none of the above.

Ans: a