Memory is the ability to hold a thought in the mind or to recall events from the past, while is the ability to retain and use memories.

Retention or memory retention

Explanation:

Memory retention is the ability to retain past events or studies from the past and be able to use them in present situations. Example of this is when a student is able to sit for an exam and recall all he has been studying over the session and be able to write on them, another example is cooking, ability to learn a cooking process and being always able to apply them whenever you want to cook.

answer; (d) they are in charge of the ushers and making sure the audience gets to their seats on time; they also control the box office; i know (c) is wrong and (b) don't make sense;