Which of the following is the correct observation of the reaction shown in the above set up?

Question: Which of the following is the correct observation of the reaction shown in the above set up?

These are the options for the question:

(a) Brown powder of Magnesium oxide is formed. (b) Colourless gas which turns lime water milky isevolved. (c) Magnesium ribbon burns with brilliant white light. (d) Reddish brown gas with a smell of burning Sulphur has evolved.

The correct answer is :

(c) Magnesium ribbon burns with brilliant white light