Answer:
The correct answer is letter "B": pay less for the security that has higher risk.
Explanation:
While investing, risk is a measure of how an asset can fluctuate providing profits or incurring losses. Risk investment tends to be associated with volatility which is how sensitive the asset is to respond to events that can make the asset price skyrocket or drop sharply.
In case an investor believes his strategy will provide a fair return, he must be considering the net profit (gross profit minus initial investment) will be high enough. Besides the initial investment should have been purchased at the lowest price possible and the asset bought must represent the security with the highest risk at the moment of the purchase.