The correct option is D 60∘, 90∘, 90∘, and 120∘
Let the smallest angle of the quadrilateral be 2x∘.
Then, the other three angles will be 3x∘, 3x∘, and 4x∘.
Now, we know that sum of all the angles of the quadrilateral is equal to 360∘.
2x∘ + 3x∘ + 3x∘ + 4x∘ = 360∘
12x∘ = 360∘
x∘ = 30∘
Hence, all the four angles of the quadrilateral are 60∘, 90∘, 90∘ and 120∘.