Repeating the items on a grocery list such as "cheese, bread, soda, canned soup, salad dressing, and paper napkins" over and over again in your mind is an example of what process?

    Rehearsal  

Explanation:

According to psychology, when we need to store information in our short-term-memory, we can use different methods. One of them is Rehearsal.

Memory rehearsal consists in repeating over and over again the thing that we want to memorize in order to store it in our short-term memory (like when we repeat a telephone number before writing it down), this process doesn't involve an actual learning but rather a way of keeping things in our mind until the moment we need them, after this, they are discarded and they don't go into our long term memory.

Repeating items on a grocery list over and over again is an example of rehearsal since you are repeating them so you can remember until you go to the store and get them and then you forget about it and it doesn't go into your long-term memory.

the density would be a smaller number.