Which statement is true of facts and opinions?

The word "fact" is a synonym of the word "opinion."

Facts and opinions are not necessarily in opposition.

In research, it is important to use facts or opinions, not both.

An opinion is always more important than a fact.

1) - no, they're not synonyms.

2) - yes, they don't need to be in opposition! you can have an opinion that is also a fact (for example, i have the opinion that global warming is man-made, and this seems to be confirmed by science

3) you should use facts in research, opinions can suggest search for facts, but don't used them!

4) I would stay the opposite is true.

A fact is a statement that is true and it can be judged objectively. So that, a fact is true and correct in all circumstances. An opinion, however, is a statement that based on a belief; it shows how someone feels. Indeed, opinion and fact are not synonyms. Both opinion and fact applied in education. Therefore, in research you can use both of them. An opinion is not always true. Therefore, it cannot be proven. It shows that the last option is not true. Opinion is not important than facts. Opinions can be based on facts. It shows that facts and opinions are not in opposition.