Cobra Mining Company spent $200 million five years ago to develop underground mining and milling operations in a remote area of a western state.

Cobra Mining Company spent $200 million five years ago to develop underground mining and milling operations in a remote area of a western state. Metals prices have since declined precipitously and the company is considering abandoning the operation. The term that would best describe the $200 million expenditure when considering the abandonment decision is:A) sunk cost.B) variable cost.C) differential cost.D) opportunity cost