Answer:
Traditional economies may be based on custom and tradition, with economic decisions based on customs or beliefs of the community, family, clan, or tribe.
Explanation:
Bhutan
The constitution was ratified on the 29 of May, 1790.
The correct answer is option D. "Companies replaced hand-operated brakes with air brakes on trains". The development of air brakes on trains was a significant improvement of railroad safety. Air brakes function much more faster than hand-operated brakes, because hand-operated brakes required that the brakemen turned the brakes in one car and jump to the next to set the brakes on, and so on.
