The stress-strain curves are drawn for two different materials X and Y. It is observed that, the ultimate
strength point and the fracture point are close to each other for material X but are far apart for material Y. We can say that, materials X and Yare likely to be (respectively)  

The stress-strain curve for a material is shown in figure.

This curve specifies the behavior of material.
For the material X, as the distance between ultimate strength point and fracture point is small, so it is brittle and will break easily on the application of some extra stress after point D. 

For material Y, as the distance between ultimate strength point and fracture point is large, so it is a ductile material and can withstand for some extra stress beyond point D.