I will jelp you.
Automation in the sentence refers to B. The use of machines that function on their own.
Answer:
A synecdoche is naming the whole based on part. A or C fit this well.
I think the correct answer would be option D. Expository writing never includes devices of writing such as figurative language or narrative. This type of writing is used to give information, explain and describe a certain topic so it should use simple words and is straightforward.