Wouldn't it be Problem and Trouble?
The rest wouldn't make sense...
The answer is b to support the authors opinion about oceans
Think of it like this
Internal: A force inside yourself
External: A force outside of yourself
So if there an external force, it’s a force from outside so an example would be bullying. You wouldn’t want to go where you are being bullied so that would be an outside force affecting you.
The answer is irony because of the fact that the main character is the prospect for the hunt.
