How Do Rational Choice Theorists Describe the Ways Opportunity Costs

How do rational choice theorists describe the ways opportunity costs constrain actions?

A) Actors must consider the scarcity of resources.
B) Actors must consider the feasibility of actions as prescribed or prohibited by social institutions.
C) A consideration of the cumulative social effects of individual actors should be considered.
D) A consideration of available information (or lack thereof) should be considered.