What is true of satire: The intent is to convince the masses to trust their leaders; Rooted in the hope for reform; Based in ancient folk wisdom; It's intent is to provide light-hearted entertainment?
Of the given choices, satire is "rooted in the hope for reform".
Satire serves a number of purposes, one of them is a hope for reform delivered in the form of entertainment. Other purposes of satire are, to illustrate a situation to the public in a less critical or obvious manner than a speech, to relieve the stress of a situation for the satirist and the audience, and to rally support for the satirist's point of view. Satire entertains, but it also gives an audience something to think about.
There are times and places that it has been (is) dangerous to express disapproval of or the inequities of authority. Satire can provide a venue to express what can't be spoken about.
Not all satire makes light of serious situations. Satire can also be used to simply make fun of someone or something. This may be described as satire for entertainment but should not be considered as "light-hearted" because it's so often mean-spirited.