Hi!
I don’t know if this is a multiple choice question or if you’re supposed to write your own answer, but here’s my answer.
A biased opinion would be the opinion of someone being rewarded to have that opinion. For example, if someone was selling a product, their opinion would be biased, because they are being paid to like that product.
A non-biased opinion would be an opinion of a consumer. For example, maybe you have an opinion about certain books you do or don’t like to read. I could tell you my opinion on some of my favorite books, and it wouldn’t be biased because I am not being rewarded for liking those books, it’s my genuine opinion.
Hope this helps! :)
-Peredhel