Using the stress$-$strain figure below, answer the following $($total of $8$ points$)$

a$.$ Assuming the proportional limit is $120$ MPa at a strain value of $0\mathrm{.}0018$ for material A $,$ what is the elastic modulus? $(1$ point$)$

b$.$ Assuming the stress for Material B at a strain value of $0\mathrm{.}0009$ is $300$ MPa $,$ what is the elastic modulus? $(1$ point$)$

c$.$ What type of bonding do you think the material in curve a has compared to curve b$?(1$ point$).$ Draw the bonding F vs$.$ interatomic distance and bonding E vs$.$ interatomic distance curves for both materials $($draw on the same figure, make sure to label each curve one$).(4$ points$)$

d$.$ What properties might you expect for each material $($name at least two for each material$)?(1$ point for each material $-2$ points total$)$