A.
Gerunds generally end in -ing, and the subject of the prepositional phrase "for meeting" is meeting, which means it is the object of a preposition.
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Answer:
All of these would be correct.
Explanation:
Mournful: feeling, expressing, or inducing sadness, regret, or grief.
Melancholy: a feeling of pensive sadness, typically with no obvious cause.
Despairing: showing the loss of all hope.
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