If Uranus and Neptune had no satellites at all, would you expect them to have rings? 

a. Yes; the rings would be even more substantial since they are made of material that did not form moons. 

b. Yes; the massive planets attract ring material with their gravity. 

c. No; there would have been no moons to crush into rings. 

d. No; ring material comes from the moons.

e. none of above