Study the given figures carefully.

Select the correct observation.

Options

A. The flame finally goes off in all the three cases.
B. The flame flickers and produces smoke in all three cases.
C. Candle burns freely in I and II and flickers in III.
D. Candle burns freely in I.

Answer

D

Explanation

In I, air can enter the chimney from below hence, dle burns freely. air cannot enter the chimney from below hence, flame fers and produces smoke. All flame finally goes off because air is not available.