Although it’s not a rule, usually the full name or the full form precedes the short name or the short form. For e.g, You would use Karl Marx first before you start saying Mr. Marx. By applying the same line of reasoning, the idea of ‘mobile phones’ in statement D should precede ‘phones’ in statement C. We can thus eliminate options 1 and 4.
All the other 2 options - 2 and 3 have statement D as the start.
Option 2 moves from statement D to statement C. Statement D talks of complicating matters while statement C moves on to public events requesting switching off phones. Possible flow of logic but, not a very convincing one. Statement B follows talking of ‘it can be used almost everywhere’. Everywhere as an idea does not flow with public event. On the other hand, if we consider statement B as a new idea, not closely connected with statement C, then the jump in ideas from statement D to statement C and from statement C to statement B is too abrupt. This eliminates option 2.
Option 3 flows well through the entire sequence. Statement D introduces the idea. Statement B takes the idea further and A gives specific inputs to what does it mean by ‘anywhere & everyone’. The passage concludes with a specific course of action which is an outcome of ‘complicating matters’ in statement A, ‘everyone and anyone’ in statement B, and ‘examples of social events’ in statement C.
Hence, the correct answer is option 3.