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In an experiment to study the rate of water loss in plant...

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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
II. Lower surface covered with Vaseline
III. Both surfaces covered with Vaseline
IV. None of the leaf surfaces covered
Indicate in a 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 is D

No explanation has been provided for this answer.