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".

Ex Input:
[header] How to effectively use email at work [title] Allocate specific times of the day to read and respond to your e-mail. [step] If you don't stay in control of checking your e-mail, you may end up wasting too much of your work day checking it. Try to respond to emails immediately. <sep> (A) While you can use your email system to get more emails, remember to adjust your work email usage to accommodate any change in time. [substeps] Use social media to check your e-mail and read your e-mail. (B) [title] Organize your email whenever you are in it. [step] Effective use of work email includes deleting emails you know you won't need as you read them and filing those that you will need in specified folders. (C) Staying in control of your personal email should be your top defense when handling an in-office correspondence. [title] Identify your e-mail's subject line. (D) Or try to set an automatic schedule to read them at other times. [substeps] Plan to read at least once a day, unless you work on a busy schedule.

Ex Output:
B

Ex Input:
[header] How to install debian [title] Back up any important files on your computer. [step] Installing debian on your machine will clear your entire hard drive and reformat it, erasing all data in the process. Store your important information on a removable drive before beginning the installation. <sep> (A) [title] Navigate your web browser to the debian website. [step] Debian is distributed through www.debian. (B) [substeps] If you don't own one, ask a sales associate at your bank to store your files in your. Otherwise, you can install them on your own hard drive. (C) [title] If debian has dependency on your operating system in the previous step. [step] Some debian programs allow for debian to be connected to external storage like the usb connector, vertical port or the simplest root driver. (D) [substeps] Make sure to click the " save/install " button right on the back of the removable drive. [title] Locate and modify the " reason for installing debian " website.

Ex Output:
A

Ex Input:
[header] How to make english muffins or bread [title] Make a sourdough starter. [step] Combine 2 1/2 cups of flour, one packet of yeast, and 2 cups of warm (90-110f) water in at least a 8 cup bowl. Mix with a spoon until it is a smooth batter. <sep> (A) Spread 1 cup extra-sweet and/or spring-loaded yeast flour into the dough. Use your fingers to form a dough ball and set it aside, laying it out on clean, cool, and level surface. (B) [substeps] Make sure the batter isn't too thick, as it could clog the muffin pans on your way home. [title] Stir the yeast and condensed milk until the mixture is sticky. (C) This will sit and " cook " for at least 4 hours during which time it will increase in volume a lot (hence the big bowl). Cover with some plastic wrap or a cloth and leave in a warm place (room temperature is fine). (D) [substeps] You can choose your type of sourdough starter mix, as well. You can use a clay mix, a matte one, or something else.

Ex Output:
C