While deriving an expression for loss of head due to a sudden expansion in a pip

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Question
While deriving an expression for loss of head due to a sudden expansion in a pipe, in addition to the continuity and impulse-momentum equations, one of the following assumptions is made :
Options
A. Head loss due to friction is equal to the head loss in eddying motion
B. The mean pressure in eddying fluid is equal to the downstream pressure
C. The mean pressure in eddying fluid is equal to the upstream pressure
D. Head lost in eddies is neglected

Correct Answer

The mean pressure in eddying fluid is equal to the upstream pressure

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