You will be given a definition of a task first, then some input of the task.
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 collect email addresses [title] Create a sign-up sheet. [step] If you have an actual storefront, place an e-mail sign-up sheet near the register. Point it out to each customer who makes a purchase. <sep> (A) This will hold the full month's sales price because the business's members will not need to sign-up. Plan to take into account the current set of needs for the business as well as the current challenges it may face financially. (B) Sometimes you may also wish to advertise by adding the name of your company into the business sign-up sheet. [substeps] For example, if your office features a storefront, point your e-mail door in that direction. (C) [title] Copy e-mail addresses from customers instead of typing them in. [step] Print off enough e-mail addresses to collect as many e-mail addresses as you want from everyone but your customer. (D) [substeps] Similarly, you can instruct your cashiers to ask each customer who approaches the register for an e-mail address. Make sure that your cashiers tell your customers that providing an e-mail address is only optional while explaining the benefits of doing so.
Output:
D