The part of speech used in this sentence is a VERB
It's B. three.
Paris, France is one item, not two. Paris is located in France.
In general Huck is a character who tends to separate himself from people he disagrees with. If someone thinks something in a different way than he does, Huck will be grim about it and won't have the desire for that person to be near him or he won't even listen to them. Often it happens that he has to do it even if he doesn't want to.
NaF is not covalent, but ionic, as Na and F are on opposite sides of the periodic table.