Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

Sound travels with a different speed in media. In what order does the

1.	Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
A.	Water, iron and air
B.	Iron, air and water
C.	Air, water and iron
D.	Iron, water and air
Answer» D. Iron, water and air