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

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.

the language dates from the contacts of arabian traders with the inhabitants of the east coast of africa over many centuries. under arab influence, swahili originated as a lingua franca used by several closely related bantu-speaking tribal groups.

- "the civil rights movements"

- "following the american civil war and abolition of slavery, the united states entered a period known as reconstruction, during which black americans continued to suffer from disenfranchisement, racial segregation, and economic oppression. beginning in the early 1950's, black americans launched a series of major campaigns of civil resistance, emphasizing the need for nonviolent protests and civil disobedience."

"such as the montgomery bus boycott of 1955-56, a campaign launched by rosa parks against the policy of racial segregation of the public transit system in alabama. “sit-ins” became popular across the american south, particularly in greensboro, north carolina, increase national sentiment."

- "the counterculture movement"

- "counterculture began to develop in the united states following the rise of conformity in american culture during the 1950s. by 1963, youth, particularly those of the white middle class, began rejecting the cultural standards and normality of their parents, opting for progressive attitudes instead. the movement gained momentum as the civil rights movement became increasingly successful and as the u.s. military intervention of vietnam began to take a negative turn."

"hippie counterculture moved further into popular culture following the summer of love in 1967 when thousands of people came together in the haight-ashbury neighborhood of san francisco. along with greenwich village in new york city, haight-ashbury became a hub for the counterculture movement."