Why a surface integral is used to represent flow of B into and out of

1.	Why a surface integral is used to represent flow of B into and out of the control volume?
A.	Control volume is moving
B.	Flow of fluid is through the control surfaces
C.	Fluid only on the control surfaces
D.	Control volume is stationary
Answer» C. Fluid only on the control surfaces

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Why a surface integral is used to represent flow of B into and out of the control volume?

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