Which of the following is an example of an implied warranty?

An implied warranty refers to the unspoken, unwritten guarantees that are automatically provided by law upon purchasing a product. Specifically, when a seller offers a product, there is an inherent understanding that the product will be fit for the general purpose for which it is sold. This means that consumers can assume that the product will work under the ordinary conditions for which it was intended.

In the case of option A, the promise that a product is fit for a particular purpose clearly aligns with the concept of an implied warranty. This warranty is not necessarily documented or explicitly stated; it exists due to the nature of the transaction and expectations around product performance.

Other options represent different concepts. A guarantee written on a product's packaging refers to an express warranty, which is explicitly stated and can be legally enforced. A verbal assurance given at the time of purchase, while it may create expectations, can be more subjective and harder to enforce compared to the standard of an implied warranty. Lastly, a legally binding contract upon purchase suggests a formal agreement with defined terms, whereas implied warranties function independently of such contracts, arising automatically under consumer protection laws.