D. He realized he was being punished by God for his disregard for his father's advice.
Answer: President
Explanation: The position that requires you to be a natural born american citizen is "President"
Spender is the archaeologist for the fourth expedition. He reveres Mars and quickly leaves the crew to explore the planet by himself. He learns to read Martian. Finally, he decides that he should kill off the crew in an effort to preserve Mars.
