As a writer I find it hard sometimes to write unrestricted. I often feel as though I need to appeal to someone. This quote is very nice to hear because it kind of relaxes that thought of needing to be something instead of just being myself through my writing.
Documentation/citation of Info and Ethics.
The best answer would be Letter B - to entertain.
The author merely would like to provide amusement to the readers at his expense. It certainly does not persuade, explain, nor inform anything since it states - <span>But why bother with the descriptions; you’ve probably already grasped the idea!</span> - which could be taken as a witticism.