Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, select No Improvement.While there is still a debate about why depression, anxiety and suicide have skyrocketed among people, today, ubiquitous smartphone use plays surely a part.

• A. No Improvement
• B. smartphone use surely plays a part
• C. smartphone usage plays a part surely
• D. smartphone use would surely play a part