Question

Which of the following planets has ammonia clouds in its atmosphere?

Answer 1

Jupiter and Saturn has ammonia clouds in its atmosphere since the molecules of ammonia gas that are present in their atmospheres condense to form clouds. However, these ammonia clouds are more visible in Jupiter than in Saturn because of their lower altitude in Saturn.
Since the orbital speeds are slower for planets with larger orbits, we can arrange the planets by their orbital speeds from the slowest to the fastest: Saturn<Jupiter<Mars<Mercury

Answer 2

Jupiter and Saturn has ammonia clouds in its atmosphere but they are more recognizable on Jupiter because they have a lower altitude on saturn.

Saturn<Jupiter<Mars<Mercury would be your answer.