In the given stress-strain graph,what does point $D$ indicate?

The stress-strain graphs for two materials $A$ and $B$ are shown in the figure. The graphs are drawn to the same scale. Select the correct statement.

The diagram shows the stress versus strain curve for materials $A$ and $B$. From the curves,we infer that:

$A$ student plots a graph from his readings on the determination of Young's modulus of a metal wire but forgets to label the axes. The quantities on $X$ and $Y$ axes may be respectively:

The strain-stress plot for materials $A$, $B$, $C$ and $D$ is shown in the figure. Which material has the largest Young's modulus?

In plotting stress versus strain curves for two materials $P$ and $Q$,a student by mistake puts strain on the $y$-axis and stress on the $x$-axis as shown in the figure. Then the correct statement$(s)$ is(are):
$(A)$ $P$ has more tensile strength than $Q$
$(B)$ $P$ is more ductile than $Q$
$(C)$ $P$ is more brittle than $Q$
$(D)$ The Young's modulus of $P$ is more than that of $Q$