As the reflux ratio in a distillation coloumn is increased from the minimum, the

[A].	slope of the operating line in stripping section decreases.
[B].	number of plates decreases very slowly first and then more and more rapidly.
[C].	total cost first decreases and then increases.
[D].	liquid flow increases while the vapor flow decreases for a system.

Answer: Option C

Explanation:

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