The correct answer is: C) The amount of money required to buy a car.
In economics a "factor of production" is used to "describe the inputs used in the production of goods or services in order to make an economic profit". This means it includes the resources you need to creat this good or service. They are divided in: land, labour, capital and enterpreneurship.
In this case the "money" used to buy a car is not involved in producing a goos or service, it only buys a good or service. Money can be used to buy capital but it is not capital by itself.
Option A and B are considered as labor, which is the effort people puts in the production goods.
Option D is the land which includes any natural resources used to produce goods and services.
