Which of the following is not a question you should ask yourself when writing a summary? who are the characters involved? where is the situation occurring? when is the situation occurring? what style of writing is the author using?

You would not ask "What style of writing is the author using?" because when writing a summary, you are accounting for the events that happened in the story and the general setting. You are NOT doing anything involving the style of writing, such as analyzing or annotating the story. 

Hope this helps!! :)