A, B, and D begin statements that can stand by themselves logically. C begins a statement that shows how the previous statement and itself are connected. As such, the answer is C(As a result).
This is off topic, and not related to homework, but I want fuzzy socks, a cat, and some books.
After Robert Fulton invented the steamboat, he tried it out on the Hudson River.
The second one! “After sofie had finished her work, she went to lunch.”
The answer is true!
I hope this helps