Answer :
Answer: A. receives the benefit of a good without contributing to its costs of production
Explanation: In Economics, a free rider is someone who benefits from goods and/or services without expending effort or paying for said resources. They consume goods without paying for their use. This is a type of market failure because while not paying for the goods or services and utilizing them, those resources may become overused, underproduced and/or degraded.
Free riding therefore is a problem of economic inefficiency as it usually leads to under-production or over-consumption of a good or resource. The big question about free riding is how to limit the practise and the effects it usually has on the society.