The correct option is D.
What Gulliver is trying to say in the passage given above is that, no matter how faithfully and loyally you have served the princes before, once you do something that they did not like all the services you have rendered to them in the past will not even be remembered by them again.
When you say 'something is of little weight' as used in the sentence above, that mean, that thing have no importance, it is something that can be easily be disregarded.
Answer:
not sure if you're referring to a specific thing or certain answers or whatnot, but basically a retelling is when you tell something again or differently.
Explanation:
an example would be when you tell a personal story to one group of friends that you're close with so you include more details, but when telling it to a group of friends you aren't as close with you would probably leave out some details