Teacher: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".
Teacher: Now, understand the problem? Solve this instance: [header] How to connect a speaker to your iphone with bluetooth [title] Place your bluetooth speaker near your iphone. [step] In order for bluetooth technology to work properly, the two devices need to be within range of each other. [substeps] If your iphone and speaker end up too far apart, you may have to reconnect them. <sep> (A) [title] Choose your wi-fi connection method. [step] You can use a standard usb port from your iphone or use an ethernet cord from your tv or computer. (B) [title] Turn on the speaker and invoke " pairing " mode. [step] After powering on the speaker, put it in " pairing " or " discoverable " mode, which typically involves pressing or holding down a button on the outside of the speaker. (C) Signal your phone and ipad via bluetooth. Signal the speaker on each phone so they can hear each other. (D) [title] Connect the system cable and the speaker to your iphone's usb port. [step] Then, connect the handles on the speaker and the volume knobs on the speakers to the cables on both devices' back.
Student:
B