B). A few years ago we found the fish full of cancers.
Explanation:
The popular speech delivered by Severn Cullis-Suzuki at the United Nations titled 'The Girl Who Silenced the World for Five Minutes' discussed the present environmental condition and issues associated with it during the year 1992 so diligently that it left the entire assembly speechless.
In the given excerpt, the statement '..a few years ago we found the fish full of cancers' exemplifies a fact as it discusses the objective reality associated with the discovery of cancer brought by fishes which could later be proved true. Thus, <u>option B</u> demonstrate a fact and is the correct answer.
