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Which of the following satement is correct?

[A].	In Lacey's silt theory, the derivation of the various formulae depends upon a single factor 'f'.	[B].	Lacey's equation includes a concentration of silt as variable.
[C].	Lacey properly define the silt grade and silt charge.	[D].	Lacey introduced semi-ellipse as ideal shape of a regime channel.

Answer: Option A