This is called the taskbar which means that the answer to this question is letter B. The great thing about this is that it can make the programs that you have to use easier to see. For example, you need to open an excel file and type some documents with your word processor.
These programs can be placed on the taskbar so that you can just click on them whenever you need to switch from the excel file to the word file. There are still other programs that you can place on the taskbar. It will not be complicated to do. In fact, it will surely make your tasks easier to accomplish. Are you ready to start utilizing the taskbar that you have?