In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the_______________?

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In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the_______________?

A. Liquid gradient on the tray (Correct)
B. Lower skirt clearance
C. Lower static submergence
D. Small downcomer liquid seal