I added a picture!
A. by showing the two sides with lengths 4 and 3 will only meet when they lie on the third side
B. by showing the two sides with lengths 4 and 3 can never meet to form a vertex
C. by showing the two sides with lengths 4 and 3 will only meet when the angle between them is large
D. by showing the two sides with lengths 4 and 3 can always meet to form a vertex
