GA Q5

MCQ1 mark, −0.33

'When the teacher is in the room, all students stand silently.' If the above statement is true, which one of the following statements is not necessarily true?

(A)

If any student is not standing silently, then the teacher is not in the room.

(B)

When the teacher is in the room, all students are silent.

(C)

If all students are standing, then the teacher is in the room.

(D)

When the teacher is in the room, all students are standing.

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