The movement known as the enlightenment focused on the idea that
a. faith in god could solve problems.
b. some problems could never be solved.
c. problems could be solved using human reason.
d. people needed to make a return to the natural world.

The Enlightenment is a movement  focused on the idea that problems could be solved using human reason. Believes in the idea of deduction – the process of gaining knowledge by using logic or reason. It was opposed by the Age of Revolution (Romanticism).

definitely a for sure. ill see and update if i get the answer

there were abundant sources of fuel nearby