Don't know if you typed this too fast spelt something wrong, so I'm not sure, sorry.
There are many parts of the peripheral nervous system, but options are not listed below.
I will use my best prediction using deductive reasoning to proves which is part of the PNS - peripheral nervous system.
The peripheral nervous system is defined as a bundle of neurons, that is neither the brain or spine (which is in the CNS - central nervous system)
As you may know the PNS, is broken down into two pieces.
The autonomic and somatic nervous system.
The autonomic nervous system as you may know is the part of the PNS, that controls involuntary activities. e.x breathing, heartrate, blood pressure, temperature, etc.
The somatic nervous system on the other hand is voluntary, and is associated with the feelings of the body. (heat, cold, touch, smell)
Answer: The automatic response to tensing your muscles after you hear the sound of the clanking the rollercoaster makes is an example of the phrase pavlov's dogs, which can refer to classical conditioning because it refers to the habit of automatic response to a stimulus.
If you really can't move your arm because of the sting, and there is pus, the best thing you can do to yourself is go to the Emergency doctor. You can take an ibuprofen if the pain is too hard.