The correct option is B 1n
If we take our original equation,
xm=k.P1n
Applying log on both sides, we get
log(xm)=log(k.P1n)
log(xm)=log k+1nlog P
If we compare this to a straight line equation, y = mx + c
You can see that y is log (xm),
mx is 1nlog P
c is log K
So the answer is 1n