My guess is A. Not a tone of info to go with, but I am a sarcastic god.
Answer:
D
Explanation:
"Jeff, the famous author and inventor, arrived late at the lecture hall for his public appearance."
The famous author and inventor is adding details on Jeff, so commas have to surround it.
Actually the real answer is A to explain the significance of the topic fro the United States.
Answer:
they usually play tennis every weekend
Explanation:
