Answer:
Option D is the right answer
All U.S. military services use drones, not all of the same type though. They use certain drones for certain things. The MQ-4 Triton is a variant of the U.S. Air Force. It is high altitude, long endurance, designed to collect intelligence for long periods of time.
Jimmy Carter was the president in 1979.
Cheaper goods made in the us and improving the u.s economy by buying more local
Silk, food, things like that. also spices