In this task, you're given an article, a question which often contains a blank and four options (associated with "A", "B", "C", "D"). Your task is to find the correct answer (from the given options) for the question from the given article and return one of the options from "A", "B", "C", and "D". Do not generate anything else apart from one of the following characters: "A", "B", "C", "D". There is only one correct answer for each question.

Article: Many people keep the stamps in a drawer at home because they'll never know when they might need them! The trouble is that they have no idea of how many stamps they have left. When they want to send something by post, it's very annoying to find out that they have run out of stamps! The Internet is possible to solve the problem. The United States Postal Service has come up with a system which allows people to print their own postage stamps at their own home! This is the perfect solution for those people that have busy lives! Whenever you go to the post office to buy a stamp, you are buying a boring and standard postage stamp. They are red in color, and you can easily buy them on the Internet as well. For example, you can just order a regular 1st class stamp and then print it off using your own printer . These days, you can have much more fun with your stamps. You can buy them online instead of going to the post office. You can decorate, preview and print your stamps all at your own home. You are able to use any of your own photos as part of your postage stamp as well. These stamps aren't just allowed to be used in the United States; they can be used to send your mail throughout the world. They are perfect to use for many special occasions, such as weddings, festivals and even birthdays! They are fantastic!
Question: The problem of keeping stamps at home is that _ .
Options: (A) the stamps may lose color (B) you may not find them anywhere (C) the stamps may be out of date (D) you do not know how many are left
D