A thesis with a general topic (your answer is a) because then you break down your essay into more detail, using the topic sentence you created to describe what you would be talking about in your essay. Hope this helps.
One theme statement for the Cask of amontillado is that revenge may not always be the best answer. There will always be a better ways to handle things rather than acting based on a pure hatred or jealousy that tend to only bring negative outcome for both side
hope this helps
