Questions: As you walk around the gym, you constantly repeat the locker combination in your head so that when you go to grab your stuff, you know the combination. This demonstrates: Maintenance Rehearsal Testing Effect Elaborative Rehearsal Enactment Effect

The answer is the first one: Maintenance Rehearsal.

Explanation for each option:

1. Maintenance Rehearsal: This involves repeatedly verbalizing or thinking about a piece of information. In this scenario, you are constantly repeating the locker combination in your head to keep it in your short-term memory. This is a classic example of maintenance rehearsal.

2. Testing Effect: This refers to the phenomenon where long-term memory is increased when some of the learning period is devoted to retrieving the information through testing with proper feedback. This is not applicable here as you are not testing yourself on the locker combination.

3. Elaborative Rehearsal: This involves thinking about the meaning of the information and making connections to other information already stored in memory. In this case, you are not making any connections or understanding the meaning behind the locker combination; you are simply repeating it.

4. Enactment Effect: This refers to the improved memory for actions that are performed compared to those that are simply read about or observed. Since you are not performing any actions related to the locker combination, this effect does not apply.

Summary: The scenario described demonstrates Maintenance Rehearsal, as you are repeatedly thinking about the locker combination to keep it in your memory.