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". 

As he continues to play, he grabs a black cloth and unfolds it over the drums to create a different sound. during the performance <sep> (A) , many photographers come on stage to film the guy until he finishes and the crowd gives him a standing ovation. (B) , the guitarist does his blower as he also plays his guitar. (C) , his face becomes agitated and there are spots of blood color visible. (D) he removes sealing tape from his drums and adds several other pieces to the same hole to finish the song.
A

[header] How to relieve constipation after surgery [title] Use a stool softener. [step] One of the first medications to try if you're feeling constipated is a stool softener. These are easy to find over-the-counter and can help get you back on track. <sep> (A) [substeps] The way that stool softeners work is that they draw water into your stool from your intestines. This makes your stool softer and easier to pass. (B) [title] Take 600ml of stool softener before a meal. [step] Most stool softeners kill the production of prostaglandins. (C) [substeps] One good option for relieving constipation at the time of surgery is a stool softener. While stool softeners do provide temporary relief from constipation, they are expensive and will often disappoint you. (D) These medications are named for their antioxidant properties, which help reduce diarrhea and keep your stools from becoming irritated. [substeps] Remember that: the next time you're using an over the counter stool softener treatment, be sure to follow the dosing instructions.
A

[header] How to put a stamp on an envelope [title] Check the size of your envelope. [step] This should be marked on the packet of envelopes, or on the envelope itself. Size 14 envelopes measure 5 " x 11. 5 " and are considered the standard size. <sep> (A) Expect standard size 0.073.2 inches. Make sure you look at the envelope closely before you move it in or out of your hand. (B) They will be rectangular in shape and will often be sold in packages at your local post office. [substeps] You can also mail a letter in an envelope that is smaller than a size 14, such as a size 10 envelope (4.125 " x 9.5 "), with a regular stamp. (C) Larger envelopes place a stamp on the envelope and can be stamped before a person or organization. Smaller envelopes may be signed with a paper stamp or with envelopes stamped with pen. (D) [title] Fold and press down firmly onto the envelope. [step] You have now created a stamp! [title] Measure your envelope for size 14.

B