Answer: That ancient land was located in the Middle East, a hot and sunny part of the world.
This is the only option that is correct. The sentence combines both ideas ("the ancient land was located in the Middle East" and "the Middle East is a hot and sunny part of the world) while maintaining the flow of the passage. Moreover, the sentence is grammatically and structurally correct.
In spite of betraying Guy, Mildred is a character who is sympathetic.
Another suggestion for a thesis:
Though she betrayed Guy, Mildred is quite sympathetic.
Explanation:
I'm guessing that is D. Everything written in any nonfiction document is true.
Answer:
1) They bought a remarkable house around the corner.
2) There were many people in the museum.
3) Jane isn't going to tell anyone.