Pretty sure the answer is A. The thesis was restated but the ending was not very satisfying and could be better.
The flagman tells the man it is not his job to issue the tickets.
He wishes his son would come back
I think the Arabs think that Santiago and the alchemist are spies. They allowed Santiago and the alchemist to keep the treasure because both have claimed that treasure doesn't have to be something material. The treasure can be something spiritual.
This is incorrect because for an argument to be valid it's premises have to be truthful. Fallacies are logical errors which make the premises untruthful and should therefore be avoided. There are various types of fallacies but most commonly they are divided into inductive and deductive fallacies.