If someone sends you this chart for a material you are considering with a yield strength (σ_yield) of 514 MPa, and the material breaks completely at a linear strain (ε) of 0.3%, what is the modulus of toughness (U) in units of kPa?

a) 1713 kPa
b) 514 kPa
c) 171.3 kPa
d) 17130 kPa