In the given figure, if AB=7.5 cm, BC=5 cm and CA=6.3 cm. Then external angles in ascending order are
A triangle ABC is shown. Angle 1 is the external angle at vertex A, formed by extending side AB. Angle 2 is the external angle at vertex B, formed by extending side AB. Angle 3 is the external angle at vertex C, formed by extending side AC.
(A) ∠1<∠2<∠3
(B) ∠2<∠1<∠3
(C) ∠3<∠2<∠1
(D) ∠3<∠1<∠2