Answer:
2. it can identify people who have been in contact with an infected person
you chooses right
A. arthritis I'm pretty sure is the answer!!!!
Answer: Anxiety around crowds can happen to people who have issue's with claustrophobia. It can also happen to people who are not comfortable around a crowd of people. Being shy however, is different. People can be shy around a crowd of people, but they can grow out of it or they can make a change to not feel as shy.
I hope this is helpful. :)