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 treat a bleeding ulcer [title] Pay attention to upper abdominal pain. [step] If you have a peptic or bleeding ulcer, you may notice moderate burning pain in your middle upper abdomen, which is between your belly button and breast bone. The pain may come and go throughout the day, but will typically be worst immediately after you've eaten. <sep> (A) If you are experiencing pain, swelling, or any other side effects, seek medical attention. [substeps] Keep track of how long your ulcer has been healing so you can determine the best treatment for you. (B) It may also intensify once you've had a meal or snack that involves a lot of blood. [substeps] In rare cases of a peptic ulcer, you may experience pain in your abdomen. (C) [substeps] The ulcer may also be painful when you haven't eaten for a few hours and your stomach is empty. Essentially, pain from your ulcer is likely to be at its worst when the stomach is either very empty or very full. (D) If your upper abdomen is a dark yellow color, call your doctor to see if your ulcer is draining blood from its area. This is a more serious cause, but also a problem to look out for.
C