Answer:
Both a and b
Explanation:
The main motivation was a) to find a new sea route to Asia, because after the Ottoman Empire took control of Constantinople in 1453, it became harder for Western European countries to trade with Asia through the East, so they began to look for alternatives through the west.
However, b) also became a motivation. Christianity was deeply rooted in political power by the time, and the advancement of Christianity not only made the Church more powerful, but the governments as well.
Answer
In 538 BCE King Cyrus made a public declaration granting the Jews the right to return to Judah and rebuild the Temple in Jerusalem. In the year 586 BCE, King Nebuchadnezzar of Babylonia conquered the city of Jerusalem, destroyed the Temple and sent many of the inhabitants of Judah into exile
hope this helps and have a wonderful day :)
https://toistudent.timesofindia.indiatimes.com/news/culture/why-was-genghis-khan-feared/11255.html theres a good article on your question
