Correct option is D
The correct substitution of the highlighted words is
"are prohibited from carrying".
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Explanation: The correct preposition after "prohibit" is "from," not "to." The verb "prohibit" is usually followed by "from" when indicating that someone is prevented from doing something.
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Grammatical rule used: The structure "prohibit + someone + from + gerund" is the correct grammatical construction. The gerund (verb + ing) is used after the preposition "from."
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Example: "The school prohibits students from using mobile phones during classes." This structure is parallel to the correct answer.