When a country’s economy becomes more developed, the standard of living usually increases. The term underlined in the sentence above is best defined as __________. A. the total dollar value of all final goods and services produced within a country’s borders in a given year B. the expense of the equipment used to increase human capabilities or make people’s lives easier C. the level of comfort the average person in a country can reasonably afford D. the measure of a country’s economic health and social conditions