单选题 There is one thing that everyone wants more than anything else. Some people try to get it by making money. They think that when they have enough money to buy such things as houses, farms, and cars, they will have the one thing that everyone wants.
Other people believe that if they know enough they will find this thing. They study all their lives in search of it. Still others think that if they have power, they will find this thing. They keep telling themselves: when I am a boss, I will no longer have to search for this thing.
What is it that everyone wants more than anything else? What is it that all of us keep working and striving for each day? It is happiness.
Happiness is a strange thing. It does not mean the same to all men. What will make one man happy may not make another man happy. Some men say that happiness comes from helping others; other men say that happiness comes from making life more pleasant for everyone. What do you mean when you say "That makes me happy"?
Read what different people have said about happiness. Perhaps you will learn something that will bring you peace of mind, comfort, money or it may bring you what you search for —happiness.

A、 other people think if they know a lot they will be able to get enough money and that will make them happy
B、 other people think it hue that enough knowledge will bring them enough money
C、 other people hold the opinion that the more they know the happier they will become
D、 other people hold the opinion that if they become knowledgeable enough they will feel happy