The correct option is B ΔL versus L2
We know that, Young's modulus (Y)
Y=FLAΔL ...(1)
Volume, V=AL ...(2)
Eq.(1) can be written as,
⇒Y=FL2ALΔL
From Eq.(1) and Eq.(2),
ΔL=FL2VY ...(3)
[Here, F,V and Y are constant, therefore FVY is constant]
⇒ΔL∝L2
On comparing Eq.(3) with the equation of a straight line y=mx+c,
y=ΔL, c=0
Slope, m=FVY=constant
& x=L2
⇒ ΔL versus L2 graph is of the form y=mx.
Hence, ΔL versus L2 graph is a straight line passing through origin.