It's C or D I am not sure, either. But I might say it's C
Answer:
Adjective
Explanation:
Depending on the use of this phrase, it is most likely an adjective since it is describing an object.
Changes around us cause us to act differently. Some people don't act well around changes and others do. I personally don't act well around changes. Different causes and affects can make people act different. For example moving is a change and some people will act happy and positive where as others would be sad or angry.