Repeatedly presenting the conditioned stimulus without the unconditioned stimulus will eventually result in

The answer is: Extinction
In psycchology,  extinction refers to a situation when a conditioned response that result in a certain behavior starts to fade away.
When conditioned stimulus exists without the unconditioned stimulus, the brain will have no basic response toward that certain stimulus, which will cause the extinction.

Correct textbook answers would be 1,3, and 5

Basically create a schedule on what you need to study and stick with it