Uranus and Neptune Do Not Have Bands as Distinct as Those

Uranus and Neptune do not have bands as distinct as those on Jupiter and Saturn, because Uranus and Neptune:

A) have wind speeds that vary more smoothly from the equator to the poles
B) are composed entirely of hydrogen and helium and lack more complex molecules
C) are much closer to the Sun and much colder
D) rotate 10 times slower
E) have larger masses