Given the task definition and input, reply with output. In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".

[header] How to store coffee beans or ground coffee [title] Store your coffee in an airtight container. [step] One of the biggest enemies of fresh-tasting coffee is oxygen. Exposure to the air causes coffee beans, and especially ground coffee, to go stale very quickly. <sep> (A) Use your coffee immediately after it has been percolated and is stored in an airtight container. [substeps] Do not include coffee in your refrigerator, freezer, and storage container for at least 12 days before brewing. (B) The air filters, occasionally metal wheels, may also clump up and run as you shake your coffee beans/ground coffee, therefore resulting in bad tasting tasting and ugly coffee. [substeps] Even if this is the case, ideally that coffee package should contain double-layer jars as they will keep the coffee fresh without turning stale. (C) Coffee will expire within six to twelve months. Keep this in mind when setting up your coffee filter or compost bin. (D) Invest in an hermetically-sealed container made for storing coffee, or at least use a container with a heavy airtight lid. [substeps] Airtight containers are also ideal for preventing coffee from absorbing neighboring odors and discouraging insect and mold growth.
D