The correct answer is "-ize."
For example, I must "memorize" my vocabulary words before the test (I must "commit to memory" my vocabulary words...). On the other hand, "memorable" means that something is able to remembered, the suffix -al means "pertaining to" (natural--pertaining to nature), and the suffix -ies simply changes certain words to plural meanings (party, parties).
To basically go through a paragraph and shorten it and put it in your words basically saying what it’s about. It’s very simple
"You would do the quote, in the way I'm doing here, the put the last name of the author and the page number in parenthesis." (Tunis, 18)