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:
Two men are doing martial arts with others around them watching. Many other men are shown doing several flips and tricks around each other. two men <sep> (A) are shown hitting people to give them an out and another man joins in. (B) are joined by a woman. (C) flip near each other while others around them watch. (D) stand on a mat while a man is bartending around them.

Ex Output:
C


Ex Input:
[header] How to ask customers for feedback [title] Use a survey. [step] Surveys are the easiest method for collecting feedback. You can create a survey on surveymonkey and then send an email to your clients. <sep> (A) You can also post a link to the survey on your twitter and facebook pages. [substeps] Consider posting short surveys on your website using qualaroo or an equivalent tool. (B) This gives you a much-needed opening to discuss your feedback. [substeps] Write a survey that states how well the company is doing. (C) Keep in mind that you are going to be giving customers feedback about your company. The survey can be in the form of a written question or business letter, a presentation or post, or forum. (D) Be sure to include your real name so that the survey can be retrieved and someone else can reach out to you if needed. Customers then will be able to find you and send you back their feedback.

Ex Output:
A


Ex Input:
[header] How to measure stair stringers [title] Determine the overall height of the stairs. [step] Extend a level out across the upper edge of the deck or porch (or the entry point, if you're building stairs for a shed or similar structure). Stretch your tape measure from the bottom of the board to the ground. <sep> (A) [substeps] Note that using a tape measure on stairs is a common-instinct in the engineering world where experienced construction workers are always willing to stand if needed. [title] Measure the length of each stair at the height of the slope (not the upper edge, if it has greater stairs). (B) [substeps] Make sure your tape measure is also at least 38 in (41 cm) from the bottom edge (for a shed or similar structure). You can also use great gauge tape which can be purchased at a hardware or home improvement store. (C) This will tell you exactly how high the new stairs will reach. [substeps] The stringers are the notched, sloping boards that will go on either side of the stairs to hold the steps and support the weight that's placed on them. (D) How high you get depends on the roof of your house. [substeps] If you're building stairs for a shed, it should be at least about a meter high.

Ex Output:

C