Answer:
A) to add more detail
Explanation:
Modifier is a single word, a phrase or even a clause that, as the name suggests, modifies certain word (a noun, a verb etc.)
This basically means that it provides us with more detail and some extra specific information.
Let's look at the example:
A boy sat in front of the house.
Adding some modifiers, we could get:
A small, sad-looking boy with red hat sat in front of the big, old, abandoned house.
All these modifiers added details that helped us visualize better and more vividly this scene.
Often these modifiers do completely opposite of help writing be more concise, so one should be careful when using them.