This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to start single tasking
Remove distractions from your workspace.
Help yourself concentrate by removing prevalent distractions: phones and personal and work computers can provide countless distractions that prevent you from focusing on a single task. Silence your phone and close your personal email while working on a task.

Available options:
(a). Likewise, if you're at home or with family, block distractions so that you can focus only on your work. Recognize the limitations of single tasking.
(b). This will help you prioritize your day. Remove your desk clock and your other personal devices from your work space.
(c). You can also remove physical distractions around you. If you work in an office, shut the door and hang a sign that reads " working, please don't interrupt.
(d). If you keep any apps that interfere with your concentration, you may need to shut them off completely. Click the start button on your office phone if you have the option.
The answer is:
(c).