How do I do this problem?

so a quadrilateral is a figure with 4 sides. So looking at the picture I see 5 rhombi and 7 squares. So all together thats 12 quadrilaterals
So to find the ration you have to do:
amount of thing: whole
so in this case it would be
12:24
which you can simplify
normally you'd simplify to 1:2 but that doesn't seem like an option so I'd go with the one closest to that ratio