What happened when enlightenment thinkers began to question traditional ideas? a. existing government laws and policies were accepted.
b. heavy emphasis was placed on established concepts.
c. greater importance was placed on religion to solve problems.
d. reason and knowledge were used to explain beliefs.

During the enlightenment, (D) reason and knowledge were used to explain beliefs. The thinkers during this period said that the traditional ways usually related to religious beliefs and systems caused destruction to humankind. They believe that reason and knowledge were the new truths, and progress goes along with it.