Concept:Private goods are defined by two key features: rivalry in consumption and the ability to exclude non-payers.
Explanation:A private good is rivalrous because when one person consumes it, the quantity available for others decreases.
It is excludable because only those who pay for it can benefit from it.
Examples include food, clothing, and cars.
The principle of exclusion is applied fully to private goods, and their consumption is competitive.
Therefore, they do not fit the descriptions of non-excludable or non-rivalrous goods.
Answer:B. rivalrous and excludable.