For a scientific theory to be valid, which of the following must be true?

a. it must be well tested.
b. it must be widely accepted.
c. it must explain the observable facts.
d. all of the above

explain

Can someone me with this plz? ! i'm putting 20 points on it!

How would you find the measure of one interior angle

Why did the united states lead a coalition to invade iraq in 1991? o a. there was a fundamentalist revolution in iraq. o b. iraq had invaded iran. o c. an oil embargo had started in the middle east, o d. iraq had invaded kuwait.