The power of a boiler may be defined a?

• A. the amount of water evaporated or steam produced in kg per kg of fuel burnt
• B. the ratio of heat actually used in producing the steam to the heat liberated in the furnace
• C. the evaporation of 15.653 kg of water per hour from and at 100¬¨¬®‚Äö√†√ª C
• D. the amount of water evaporated from and at 100¬¨¬®‚Äö√†√ª C into dry and saturated steam