I believe it was the racial discriminations of the age she lived in.
a DIAGRAM would be the best option as he can explain each animals food habits. (An image can also be used if he doesn't want to explain, but diagram is better)
DIAGRAM
Answer: The answer is, Julie and Yan are watching the moon because they are night owls. Sorry First I gave the wrong answer I read it wrong
I believe the correct answer is D- <span> It rained heavily during the afternoon, but we managed to have our picnic anyway.</span>