The boy learns all of the following truths except that — a. his love for mangan’s sister is in vain b. mangan’s sister has feelings for him, too c. araby is not an exotic event d. he will not be able to buy mangan’s sister a gift

The correct answer is B.

In "Araby," the boy learns that his love for Mangan's sister is in vain, that Araby is not an exotic event (despite its exotic-sounding name), and that he will not be able to buy a gift for Mangan's sister.

What he does not learn, however, is that Mangan's sister has feelings for him, too. The only thing he learns is that she is disappointed she cannot attend Araby because she has a prior commitment.