URGENT
Which sentence states the main idea of paragraph 1?

Could we choose our environment, and were desire in human undertakings synonymous with endowment, all men would, I suppose, be optimists. Certainly most of us regard happiness as the proper end of all earthly enterprise. The will to be happy animates alike the philosopher, the prince and the chimney-sweep. No matter how dull, or how mean, or how wise a man is, he feels that happiness is his indisputable right.

1. People have opposing ideas of what happiness is.
2. People often believe that happiness requires the absence of pain.
3. People fail to understand the true meaning of happiness.
4. People feel they naturally deserve happiness.