Answer:
B. The value of the next most valuable opportunity
Explanation:
When it comes to choosing among investments, you always have to let go of other choices when you've decided to choose one already. Every option has its own benefits. However, there is an option which is always considered to have the next most valuable opportunity. This one is what you call your opportunity cost. This means, you have foregone the benefits of this option by choosing your current option.
The benefits that you could have enjoyed in choosing this option was sacrificed because you have chosen the current one.
