What is the working principle of ‘fuel-fraction’ method?

1.	What is the working principle of ‘fuel-fraction’ method?
A.	Division of mission profile into number of phases and finding individual phase fuel fraction
B.	Division of mission profile into 3 phases only
C.	Calculating fuel fraction for each stage
D.	Assuming any value for fuel fraction
Answer» B. Division of mission profile into 3 phases only

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