Which of the following statement is correct ?

[A].	A fire tube boiler occupies less space than a water tube boiler, for a given power.
[B].	Steam at a high pressure and in large quantities can be produced with a simple vertical boiler.
[C].	A simple vertical boiler has one fire tube.
[D].	all of the above

Answer: Option C

Explanation:

No answer description available for this question.