Indicate in descending order, the rate of water loss from the leaves?

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In an experiment to study the rate of water loss in plants, leaves of a potted plant were treated as follows:

I. Upper surface covered with Vaseline

ll. Lower surface covered with Vaseline

III. Both surfaces covered with Vaseline

IV. None of the leaf surfaces covered

Indicate in descending order, the rate of water loss from the leaves?

A. I, II, III and IV
B. II, I, III and IV
C. III, II, I and IV
D. IV, I, II and III

Correct Answer: Option D

D. IV, I, II and III