The correct answer is A) True.
It is true that the biggest incentive to work hard under a capitalist system is to make more money.
The Capitalist system was created to give people the product of their work. That is why they work very hard, to have a profit, to earn more money and invest the money in order to have good interests or buy whatever they want. Capitalism allows free trade, which increases the possibility of doing good business with other people, companies or nations.