Which of the following fact about dust particles in the atmosphere is/are correct? I. They act as hydroscopic nuclei around which water vapour condenses to produce cloud. II. They produce dawn and dusk. III. They have no role in the apparent colour of the sky.

Which of the following fact about dust particles in the atmosphere is/

1.	Which of the following fact about dust particles in the atmosphere is/are correct? I. They act as hydroscopic nuclei around which water vapour condenses to produce cloud. II. They produce dawn and dusk. III. They have no role in the apparent colour of the sky.
A.	I and II
B.	II and III
C.	I, II and III
D.	I and III
Answer» B. II and III