I think it’s the letter D) history
Answer:
The union had more troops than the confederacy in the West.
Explanation:
This quote means that if you choose the job of your dream, you won't feel like your working, it feels like a fun dream your whole life.
This is optimistic because it is saying that if you do what you love you'll be happy.
It will make people want to choose the best job for them so that they can do what they want their whole life!