Final answer:
Unopened coffee beans typically have an expiration period of 1 year. They should be stored in a cool, dark place and in an airtight container to maximize freshness. Using them beyond this period often results in a decrease in quality but is not necessarily harmful.
Step-by-step explanation:
The typical expiration period for unopened coffee beans is option B) 1 year. Coffee beans are best used within one year of roasting to enjoy their optimal flavor and aroma. While coffee beans do not spoil in the same way that perishable foods do, they do stale over time because the oils within the beans can become rancid. It's important to store coffee beans properly, in a cool, dark place and in an airtight container to maximize their freshness.
Using coffee beans beyond the one year period won't necessarily be harmful, but you might notice a significant decrease in the quality of the brew. For the best coffee experience, it's recommended to purchase beans in smaller quantities that can be used up within a few weeks to a month after opening.