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 Q]: [header] How to bend rebar [title] Understand the structural issues possible with manually-bent rebar and know how to avoid them. [step] When you bend metal, you naturally weaken it. When done correctly, however, you can minimize damage and still get the shape you need to complete the project. <sep> (A) [substeps] Badly bent rebar acts as a buffer for the metal particles of the laser beam. The piece of rebar you are bending dissolves when squeezed into contact. (B) This effect is part of the re-bend method. The process is a little different than rebending a rubber band, but the difference is that you bend it in half by simply opening up a v on each end. (C) Because of this, it's important for you to know how to modify the shape you want the rebar to be. If you have a badly bent rebar, you'll likely create grooves in the rebar that introduce excess material. (D) Keep the following in mind as you work : [substeps] Always note the grade and size of the bar you're bending, checking against the equipment you're using to ensure it works. Check with your project engineer to ensure your bends meet the minimal internal bend diameter.
[EX A]: D

[EX Q]: [header] How to post to a facebook group on pc or mac [title] Go to https: // www.facebook.com in a web browser. [step] You can use any web browser, such as chrome or safari, to access facebook. If you're not already signed in, sign in now. <sep> (A) [title] Click on the downward-facing arrow in the top right corner of the screen. [step] It's at the top-right corner of the screen. (B) [title] Click your profile picture at the top-right corner of the page. [step] You will see your profile picture in the upper-right corner of the page. (C) [title] Click a group to open the group's menu. [step] Click the group on the right sidebar, or the group's upper menu of options. (D) [substeps] You must already be a member of a group to post to it on your computer. See join groups on facebook to learn how to join a group.
[EX A]: D

[EX Q]: [header] How to deal with your mother's abusive boyfriend [title] Offer your support. [step] If you have witnessed the physical, verbal, or sexual abuse of your mother, you should go to her and express your concern. Tell her what you saw or heard and explain your feelings as best you can. <sep> (A) You may be scared, worried, or sad about the abuse. [substeps] It's possible that your mother may not want to talk to you about the abuse. (B) Remember that your mother's abusive husband cheated on her and did not make her feel safe. A mother's abuser is often able to play hero. (C) [substeps] Be ready to ask for the necessary advice and help. Remind her that you can be there for her if she needs you. (D) See if your mother has come to you with an explanation. [substeps] If your mother has never expressed support before, see if you can approach her on your own.
[EX A]:
A