Carter changed u. s. policy toward the developing world by focusing on A. the fight against communism B. human rights as the basis for foreign relations C. new trade agreements D. creating new military alliances

B. Hunan rights as the basis for foreign relations.

Look at what he said in 1977:

"For too many years, we’ve been willing to adopt the flawed and erroneous principles and tactics of our adversaries, sometimes abandoning our own values for theirs. We’ve fought fire with fire, never thinking that fire is sometimes best quenched with water. This approach failed, with Vietnam the best example of its intellectual and moral poverty. But through failure we have now found our way back to our own principles and values, and we have regained our lost confidence."

Th3 answer is B, human rights as basis for foreigren relations.