Teacher: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".
Teacher: Now, understand the problem? Solve this instance: [header] How to pick a master padlock [title] Make a lock pick and tension wrench with bobby pins. [step] To make the tension wrench, bend the closed end of a bobby pin until it's at a 90-degree angle with the rest of the pin. To make the single-pin pick, unbend a bobby pin so it's straight. <sep> (A) [substeps] If you are having difficulty finding bobby pins, write out something like " i'm a little bit stumped. Can you help me find the right size lock wrench for my lock? " [title] Choose a second lock wrench for small locks. (B) The bobby pin may look longer or wider depending on what you're doing, and you'll need to adjust as needed. [title] Make a " round bar trap made of locking plastic. (C) Then, bend the flat end of the bobby pin slightly upward. [title] Make a pick and wrench out of paper clips if you don't have bobby pins. (D) [substeps] To make a master lock pick without a bobby pin, twist a bobby pin and band it between two bobby pins. [title] Purchase a bomber ring tool or another flat-bottomed tool.
Student:
C