Respuesta :
The word that would best describes the tone of a letter is, brisk.
What is brisk?
Brisk means fast and full of energetic.
Because the tone of a letter should always be brisk meaning have a tone that shows that you are confident and sincere. The tone of letter should be professional and should be effective by being focused on the direct context. The tone of the letter should be quick and full of energy.
Hence the correct option is, A. Brisk.
To know more about brisk:
https://brainly.com/question/1602235
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