Answer:
One of Twain's purposes in using humor in "A cub pilot" is:
to make readers wonder what will happen at the end
Explanation:
There are two good options here that can apply as the correct answer.
to describe what life was like on the Mississippi River
and
to make readers wonder what will happen at the end
However, he didn't require humor to describe how life was on the Mississippi River. he could have used any other genre. That is why those options are discarded. Now, the reasons behind awakening interest in the readers to find out what would happen in the end come from the standpoint of how karma, life, and destiny always make the correct thing even when the reality is inclined to one side.
