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 find a penpal [title] Think about what you want to send. [step] There are many different ways to correspond with a penpal, and deciding on the one that's right for you makes it easier to sort through the number of penpal websites on the internet. Some people prefer communicating electronically while others like to use penpals as a means of creative communication. <sep> (A) [substeps] The international union of mail-artists is a website dedicated to those who like sending postal art to their penpals. Iumoa is a much more niche community as it has roughly 4 , 000 active members. (B) Read the different penpal websites carefully and decide on the one you wish to write a message for. [title] Enter the number and contact information you would like to use in the address bar (in the upper right hand corner of the web page). (C) [substeps] Remember that there is no set password to choose from across a thousands of websites, but feel free to use whatever feels most comfortable for you. [title] Narrow the search criteria to near the lowest classifications. (D) Some people like to send messages on social media or email, while other people prefer to send text messages or instant messages. [title] Decide which websites you want to find.
A

[header] How to address guests on escort cards [title] Address individual guests using their full name. [step] Guests who are planning on showing up by themselves need only be identified by their first and last name. Consider including the person's middle initial if they have a common name that may be shared with other guests. <sep> (A) [substeps] Consider the sender of each card or the recipient's first and last name. If they have a primary or joint name, include this with the full name. (B) [substeps] It's a good idea to use the name of the guest you want to address yourself. For example, if you want a library card (and you have permission to use the card), you can designate it " mr. (C) [substeps] For example, someone who lives alone may want to include " treasurer jones, " especially if their name is john smith. [title] Use text messages to identify guests based on their name. (D) [substeps] Unless your wedding is going to be an informal celebration, don't use abbreviations or nicknames-write " samantha " instead of " sam " and " william " rather than " bill. " an escort card for an unaccompanied guest might simply read: " john b.
D

[header] How to know if your rat's teeth are too long [title] Restrain your rat. [step] Your rat will not want to hold still while you look at his teeth, so it's important to make sure he is properly restrained. Ideally, you should have a second person hold the rat while you examine his teeth. <sep> (A) [title] Pay attention to a change in the appearance of your rat's teeth. [step] Teeth that are already too long may end up looking a little wrinkled instead of nice and neat. (B) When the rat is restrained, you should be able to gently lift his upper lip with your finger to observe his incisors. [substeps] The simplest way to restrain a rat is by holding him firmly around the torso with two hands. (C) However, talk to another person who should be able to pet him, but remember to stay nearby to keep the rat contained and calm during inspection. The chances of your rat having his teeth crooked or short are much higher if you hold him on a stable surface than if you are holding him in your lap. (D) However, it's even more important to restrain your rat if it looks like it's biting something, and you need to do so with your hands. [substeps] If your rat is biting somewhere, stand back and allow someone to help you.

B