Instructions: 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".
Input: [header] How to apply plumber's putty [title] Purchase plumbers putty at a home supply or hardware store. [step] Most local or chain stores, like home depot, should carry plumbers putty. Different brands use slightly different ingredients. <sep> (A) Read the instructions carefully to determine the best variety for you, and check to see if the label says " safe " on the back. [title] Use plumber's putty to enter cracks. (B) However, you should pick a putty that matches the color of your hardware and work with it instead of picking something from nature. [title] Rinse and dry your hardware and handle the plumbers putty. (C) [title] Decide if you need clay or concrete according to how much paint you desire. [step] Some plumbers waste much more clay than others, but concrete clay usually yields the paint. (D) Putty marked as stain-free should be safe to use on any material. Ask someone in the store if you have specific questions about your project.
Output:
D