It was so difficult to live under the mongols government because they are taking over some countries.
European exploration and military and cultural colonization of other parts of the world
Saint Francis of Assissi had a <em>personal experience</em> with God, resulting in his <em>conversion, salvation and a life devoted to serving God</em> and the people in a different way from the traditional church. He practiced what Jesus taught in the Scriptures, in simplicity and sincerity, and he expected that his fellow disciples did the same to spread the gospel. This had a tremendous impact on people's lives.
The answer is D, Jonas Edward Salk!