The fourth option is the right one. The Swahili city-states grew during the second half of the first millenium thanks to the intense trade activity in the Indian Ocean, <u>India and China had been important trade centers since antiquity and a great trade network had been built over the centuries</u>. Besides the connections between coastal cities of the Indian Ocean, in it's northern part, by the coast of Persia, passed the Silk Road, the trade route that connected Europe to China throughout the Middle Age.
Answer:
England, France, and the United Kingdom were the main 3.
Explanation:
The cause of the subsistence crisis in France was the population of France growing to rapidly or fast and Frances crop production could not keep up with the population.
Option B is the right answer that the Navajo sent messages to prove that the code worked.
Navajo code talkers in the 20th century were the people who used the coded language as the method of their communication during wartime. Using their Native language, the Navajo Code Talkers developed a confidential military code which gave assistance to the United States to achieve success in the Pacific during World War II.
Navajo code talkers tested their code by sending messages so as to ensure that the code can be decoded by the receiver or not.