Which outer planet has a characteristic storm called the great red spot? a. uranus b. neptune c. saturn d. jupiter

The answer is D. Jupiter
The name giant red spot is taken from the large red dots that appear on the surface of the planet and have been coined by a man named Jason  Major using came imager from NASA.
The red spots created from a massive anticyclonic storm in that planet due to its persistent high pressure.

Jupiter, mostly because it's the only red planet

No it doesnt because it can be any number.

Go to the bathroom and vape