Q: 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".
[header] How to buy soundproofing curtains [title] Measure the area where you will hang the curtains. [step] Start by determining the size of the curtains. Measure the area where you plan to hang the curtains. <sep> (A) As you measure, make sure you don't measure at an angle. [substeps] For instance, if you plan to hang the curtains 3 feet (0.91 m) from the wall, there should be at least three feet (0.91 m) of space between the walls. (B) A 10-foot (3.4-meter) distance from the floor will be fine. From one end of the area, you will need to measure the width of the curtain from the floor. (C) Use a tape measure to get the length, width, and height of the area. Make sure you add a few inches on each side of the window for the curtains to fall. (D) This will be the distance from the ceiling of the room where you will hang them. The distance from ceiling to floor will vary depending on the type of material you will hang the curtains on.
A:
C