1.  He sent a word to me that he would be coming late.

A. sent word
B. had sent a word
C. sent words
D. No improvement

Answer: Option A

Explanation:

Here word refers to collection of words. So we should not use 'a'.

If it is a single word. 'a' can be used. But it in this case word means collection of words. So 'sent word' is correct.

Hence answer: A