Answer:defect- to leave a country or political organization and go to a competitor.
Revise- make changes to improve something.
Secret police- a group that identifies and prosecutes those who oppose the government.
Slavs- groups of eastern and Central Europe who speak similar languages.
Tsar- the ruler of the Russian empire.
Explanation:
I just answered them right
The correct answer is:
A) During the Crusades.
The exchange of new ideas and inventions made throughout the Crusades is considered the earliest beginning of the Renaissance.
The Crusades increased the interest in travel and discovering Europe, which may have lead to the Renaissance. Furthermore, the Crusades serviced an increment in trade and reduced the power of European Nobles, the key to bring about the Age of Exploration.