The unique combination of words, grammar, and structure is referred to as

The unique combination of words, grammar, and structure is referred to as style.

Explanation:

At the time of writing, the writer must be sure that he is creating a unique piece.

This piece must be grammatically well written, have a good combination of words and its structure must be adequate.

This whole set of things is what make up the style.

Usually style can be confused with grammar or usage, but you have to understand that they are different, and that style is the way the writing is presented, including all these items.

1)a

2 b

3 d

4 d or b

explanation: