The principle that the cost of something is equal to what is sacrificed to get it is known as the (A) marginal principle. (B) principle of opportunity cost. (C) principle of diminishing returns. (D) reality principle

The principle that the cost of something is equal to what is sacrificed to get it is known as the (A) marginal
principle. (B) principle of opportunity cost. (C) principle of diminishing returns. (D) reality principle