It might be said that the purpose of this extract might be to provide an explanation on what the Iroquois considered the two different sides of human nature. The example of the twins could be stated in order to make the topic clearer by resorting to a common idea, so that everyone could be able to understand.
The subject and verb don't agree, the revised sentence should be
"Sequoia and Charles plan to exercise together."
Another way is to say " a lot of money for the bride"
I believe that A would be the correct answer.
