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".
Q: [header] How to weld underwater [title] Identify the site and material of the joint to be welded and clean it. [step] Most underwater welds involve steel, but metals may vary. [title] Prepare a chamber to place around the joint (each joint should have a separate chamber). <sep> (A) [step] Much of the sand used during welding will stick to metal, so consider covering the ground with sand if your project requires a flat surface. [title] Waste all the sand that is taken up by the joint. (B) [title] Find a weld compound for the joint to rest in and sandpaper those joints which are closely joined to one another for proper welder techniques. [title] Hammer the joints together using 100/200 grit sandpaper. (C) [step] Chambers range in size-some are large enough to fit several welder-divers, others are only small enough for the welding electrode. [title] Introduce gas into the chamber and pump out the water. (D) [title] Use coarse sand (also also known as regular sand) which should be used sparingly. [step] Sand is mineral grade, free from dirt and grease, making it easier to weld against the cliffs.
A:
C