"a few years ago we found the fish full of cancers" is a fact not an opinion
Answer: c. a few years ago we found the fish full of cancers. . . .
This statement gives concrete evidence that supports her claim. It also provides a statement that is "falsifiable" (that can be proven right or wrong with further research). Therefore, this is the best example of a fact. The rest of the options show either an opinion, or a subjective interpretation of a phenomenon.
