The leaders who spread Islam after Muhammad's death were Abu Bakr, Umar, Uthman, and Ali. If you want the answer from a website, I suggest going here
--> http://peopleof.oureverydaylife.com/led-islamic-world-after-muhammad-died-7743.html <-- I hope this answer helps you.
B. The National Assembly. This group dismantled the monarchy and in fall through spring of 1793-4, set about what would be called "The Reign of Terror", the bloodiest and most violent period of the French Revolution. The was led by Maximilien Robespierre and his associated Committee of Public Safety.
I believe that 3 is the most concerning issue because everyone was worried that the Soviet Union or some other country would take their land.
Answer:
Continent: Europe
Countries: Spain, Portugal, and France
Hope this helps :)