I didn’t call them. I wrote . . . . . . . . letter instead. A. a B. an C. the D. no article

The correct answer is D, no article.

The sentence “I didn’t call them. I wrote a letter instead” is about a general action, not a specific letter. Therefore, we do not need to use an article.

If we were to say “I didn’t call them. I wrote the letter instead”, this would imply that there is only one letter that could be written. However, in this case, the speaker could

In

Therefore, the correct answer is D, no article.