Several places have one-line notices. Which option is a suitable one-line notice you may find at a school?

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Please keep your cell phones on silent or switch off mode before entering the building.

Shoes must be removed from entering.

No smoking allowed in this area.

Walking on the grass is not allowed.

answer is A.

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Detailed Solution

Please keep your cell phones on silent or switch off mode before entering the building – is the correct answer because the school's environment is quiet and no disturbance is allowed. So, it is very much required that principals, teachers and parents are requested to silence the phones or to put them in silent mode. So, this is the correct answer and one-line notice for the school.
Shoes must be removed from entering – is an incorrect answer because in religious places the general public are requested to remove shoes before entering the premises. So, this one-line notice is only applicable to religious places and not in school. Thus, this is an incorrect answer.
No smoking allowed in this area – is an incorrect answer because ‘no smoking allowed in this area’ is such a notice that is used for the general people and is put in general places like bus stands, railway stations etc. So, this one-line notice cannot be used in the school. So, this is an incorrect answer.
Walking on the grass is not allowed – is an incorrect answer because such notice is used by the authorities so that the grass can be kept in good condition. Such notices are used for the general public and this is an incorrect answer.

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