Pick out the correct statement

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Pick out the correct statement.

A. The slope of the stripping line is always less than unity

B. For a given separation in a binary distillation column, with increase in reflux ratio (above the minimum reflux ratio), the fixed cost of the distillation column first increases and then decreases

C. In Ponchon-Savarit method of no. of theoretical plate determination, the stripping and rectifying operating lines are vertical at total reflux

D. Kremsor-Brown-Souder's equation is used to calculate the efficiency of a plate tower

Answer: Option C

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