Operant conditioning

How do I distinguish between two choices that I would feel like both explain the behavior in question? For example, from a KA passage:

Before receiving treatment, Katie avoided certain activities that made her anxious so that she could reduce the number of panic attacks she experienced. What operant conditioning term describes this behavior?
Negative punishment
Negative reinforcement
Positive punishment
Positive reinforcement

The answer was A. Fair enough because she is reducing a behavior...

Operant conditioning

Operant conditioning