The stress versus strain graph for wires of two material A and B are as shown. If $Y_A$ and $Y_B$ are the Young's modulus of materials then

Question

$(a)\; Y_B=2 Y_A \\ (b)\; Y_A= Y_B \\ (c)\; Y_B=3 Y_A \\ (d)\; Y_A=3 Y_B $