- AEvery person in the hall owns a mobile phone.
- BMobile phones, if kept on, may disturb other viewers.
- CThe movie being shown is not interesting.
- DMobile phones should be banned from cinema halls permanently.
Step-by-Step Solution
The request only makes sense if switched-on phones would cause a disturbance; that is the implicit assumption. The other options are neither necessary nor taken for granted.
Answer: B) Mobile phones, if kept on, may disturb other viewers.