Seeding of clouds in attempts to produce rainfall is effected by?

Question

I have the following options:

-using silver iodide flares from satellites

-using silver iodide flares from aircraft

-using huge water tanks from satellites

-using huge water tanks from aircraft

Answer 1

Using silver iodide flares from aircraft.

Answer 2

By a process of elimination, a reasonably intelligent child would be able to figure out that 3 of the answers don't make any sense, leaving only one as the correct answer.