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What happens due to high temperature of feeds water in the economizer?

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What happens due to high temperature of feeds water in the economizer?

(a) Fuel consumption increases

(b) Fuel mechanical efficiency increases

(c) Fuel consumption decreases

(d) Fuel mechanical efficiency decreases

This question was addressed to me in semester exam.

I want to ask this question from Boiler Mounting Accessories in section Steam Generators & Accessories of Energy Engineering

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The correct choice is (c) Fuel consumption decreases

The explanation: Function of the economizer is to recover a portion of heat of the exhaust gases before the flue gases enter the chimney and discharged to the atmosphere. Due to the high temperature of feed water, fuel consumption reduces. This increases the overall efficiency of the boiler.

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