In the very, very simplest terms, judging the validity of an argument starts centers around this process:
1) Identify the rhetoric (Lines of Argument) from the actual, formal reasons. Separate the persuasive language from the actual claims to truth and fact.
2) Analyze those reasons (claims to truth and fact) by identifying their logic (often in the Implicit Reasons) and evidence.
3) Test and evaluate the logic and evidence; identify logical errors and ask whether the evidence can and has been tested and objectively, repeatedly, factually verified.
The correct answer would be C. Between classes, during lunch, and sometimes on the bus.
The passage clearly states that cell phones must be in their lockers or vehicles, so cell phones cannot be used during class. It also states that cell phone use is acceptable if it does not distract others or affect their punctuality.
Lastly, the passage states the cell phone use on the bus is determined by the bus driver, so you would be able to sometimes use your phone on the bus.
Hope this helps!
Facts and details. The way to capture a reader's interest is seeming to know what you're doing, and you do that with facts and details. Hope this helps :)