Answer
B. reflects an inverse (negative) relationship between the real interest rate and investment.
Work Step by Step
Choice A is incorrect because investment decreases as interest rates rise.
Choice C is incorrect because the curve does not shift, but rather displays a relationship between real in terest rates and investment.
Choice D is incorrect because the curve does not shift, but rather displays a relationship between real in terest rates and investment.
This leaves B as the only logical choice.