Increasing Marginal Opportunity Cost Implies

Increasing marginal opportunity cost implies

A) that the more resources already devoted to any activity, the payoff from allocating yet more resources to that activity increases by progressively smaller amounts.
B) that the more resources already devoted to any activity, the benefits from allocating yet more resources to that activity decreases by progressively larger amounts.
C) that rising opportunity costs makes it inefficient to produce beyond a certain quantity.
D) the law of scarcity.