Amajor cause of the enlightenment was?

The Enlightenment was a period of scientific and intellectual innovation and of artistic innovation. There are many reasons for the Enlightenment such as…. Influenced by Greco-Roman ideals, the Renaissance planted the seeds with the philosophy of humanism and its focus on the individual. The Reformation challenged the traditional authority of the Church and furthered the ideas of individualism. In addition, the Scientific Revolution promoted observation, hypothesis, experimentation, and the analysis of cause and effect. Improvements in the education system and a sharp increase in the number of printed books helped form a society hungrier for knowledge than ever before. These events instilled an interest in the process of inquiry and analysis in the people of the era as they looked in different areas for the answers to life's questions.

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

the answer for 3 is b and the answer for 4 is d