Question

Identify the kind of letter for which the following is appropriate:
Thank you for your prompt attention to this matter.

• A. formal
• B. informal
• C. semi-formal
• D. business

Answer 1

Answer: (A), (D)

The correct options are
A formal
D business

The tone and style of formal letters and business letters are the same. Both must be written in formal language, avoiding any style or diction that is considered as friendly or casual.
Options A and D: The given sentence is written in formal language. There is nothing casual or informal about this sentence
Hence, options A and D are both correct.
Option B: Informal letters are written to relatives, friends and people from one's personal life. Hence, they are written in a friendly tone, and this sentence would not be appropriate while writing a letter to a friend.
Option C: Semi-formal letters are written to those with whom one has a day-to-day interaction, like colleagues, teachers, mentors: a person in authority whom you respect. The given sentence does not have a semi-formal language, it is strictly formal.
Hence options B and C are incorrect.