Answer:
d. Huck only tells the truth when he can profit by it.
Explanation:
Huck gives a particular thought when he writes in The Adventures of Tom Sawyer, giving the reader to understand that the lies that Sawyer said where okay or partially-morally correct when they could be excused and not discovered.
This can´t be considered as a moral retribution because a lie is a lie, even though is harmless.
However, Huck proves in his book that the truth -in his perception- is only viable when you cna profit it, doing option d the correct one.