Which of the following can best express the main idea of the passage（）A．Never be satisfied with what you have.B．Start a business as a customer.C．It is profitable to find fault with what you have.D．To start a business is to make a fortun

单项选择题

Which of the following can best express the main idea of the passage（）

A．Never be satisfied with what you have.
B．Start a business as a customer.
C．It is profitable to find fault with what you have.
D．To start a business is to make a fortun