'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?

Combinatorics deals with problems involving counting. For example, "How many distinct arrangements of N distinct objects in M spaces on a circle are possible?"...

Expedite, Hasten, Hurry, ________.Fill the blank by choosing a word with a meaning similar to that of the words given above.