I'm not sure but I think its D
Answer:
One of the great contributions the Sumerians made to civilization was their many inventions. They invented the first form of writing, a number system, the first wheeled vehicles, sun-dried bricks, and irrigation for farming. All of these things were important for the development of human civilization.
Answer:
Trisha had worked at the video store for only three months before she got a raise.
Answer:
D) For instance
Explanation:
This type of phrase tends to be a part of an example type sentence. The others are carrying off of a previous sentence, and leads to a result detail.