7. The United States, Japan, and France are classified as developed countries

because

A the people are healthy and educated

B they have a low GDP

C they have a high trade balance

D the people receive little health care

Answer: I assume that the answer A explains why they are developed countries and also the most obvious answer.

If people are healthy and educated in a country it is assumed that there is a vast amount of access to basic needs and services (suggesting why A is the answer).

Why the other answers aren't necessarily correct:

Low GDP can be bad for the economy ruling out Answer B

High Trade Balance as in a deficit or a surplus? Are they producing more than they buy or buying more than they produce? A surplus would indicate that the economy is good, but a deficit would be bad for the economy. Depending on this, Answer C may/may not be the answer.

People receiving little health care means that they may pass away as a result of little to no access to basic needs and services. Answer D would be the least correct answer out of the four answers.