If Rm is the minimum reflux ratio, the optimum reflux ratio may be around _________________ Rm ?
A. 1.2 to 1.5
B. 2.5 to 3
C. 3 to 4
D. 5
A. 1.2 to 1.5
B. 2.5 to 3
C. 3 to 4
D. 5