Is that your selected answer - shed?
Hmmm. That’s an interesting question. 
There’s a little home inspection terms dictionary on nachi. Use it to look up “gable”. Then look at the shapes of all of the above roofs. Find the one that doesn’t have a part of the roof that looks like a “gable”
To answer your question, a HIP roof. HIP Roof style: Four sloping sides that meet at a common peak.
The answer was created in 1968!
The answer is: NUMBER 9!
No choice. I wanted “all of the above” but that wasn’t an option.
One problem with your answer. All 4 of them are their own roof styles, so none of the three possible answers has a “gable.”
The definition of a “gable”.
ga·ble
/ˈɡāb(ə)l/
noun
I know what a gable is, I’ve been a professional carpenter for over 30 years. I’ve had to answer questions on the exams based on the course materials multiple times, even though I known the answer was wrong in construction terms. This time it’s the worst example because that wasn’t even covered in the course.
Hi, Devon. Hope you are doing well. I’m pulling for you buddy.
The idea here is to think specifically. Not generalist.
And yes some of the questions on tests are to trick your thinking process with variation similarities.
You did right by coming to the message board. Don’t worry, some do not know how to play nice. Just ignore them. Lots of us here are pulling for you buddy.
Let us both look at the question.
The style of roof that does not have a gable is called a ____roof.
A Gable is a triangular wall at the end of the roof.
A hip roof has four sloping sides that meet at the top to form a ridge.
A gable roof has two sloping sides that meet at the top to form a gable, which is a triangular wall at the end of the roof.
I agree with Robert. Hip would be the best possible choice.
Question could’ve been worded better. Hip is the best option.
This is correct. Poor question. Best answer of the three is hip.
But none of them, in my world, have gables. But maybe I need to adjust my definition of “gable.”
The style of roof that does not have a gable is a Hip roof.
A gambrel roof definitely has a couple gable ends.
I agree. The mostest bestest correctest answer is hip. But I don’t think he really wanted an answer. 
25+ years ago when I took some classes for this biz, whatever textbook we used hammered home architecture things like this. 25 years later I’ve never once used any of it. Naming roof structure types is the HI equivalent to high school Algebra… you’ll NEVER use it.
Well, maybe I shouldn’t have said “never” since you need it now 
Hip is the answer they are looking for.
last time i checked a shed roof has no gable end either but maybe it’s just me.