Answer:
Sharon is a magazine columnist.
Step-by-step explanation:
In the context, it is given that my friend met a new acquaintance in the library. her name was Sharon and is very outspoken and very bright. She majors in philosophy and she is deeply moved by the social injustice and the discrimination issues. She demonstrates her concerns on her blog post and also takes turn in participating in the anti-nuclear rallies and demonstrations.
So determining biases, it is more probable for Sharon to be magazine columnist.