Can anyone help answer this?

c i think or d

Explanation:

okay my name is Henry First take a deep breath lets think about your awnser first we read the question and then we write a short sentence using proper words now i can help you with your awnser first Step-By-Step we figure out what the awnser will be and why you chose this awnser

let's start out with facts

a time line cause it goes from 685 to 978

idk why hjggjhjkhj