"<span>b. Wealthy merchants in northern Europe offered enormous sums of money to Renaissance artists who would reveal their secrets" was not a way in which this happened. Renaissance artists and thinkers were not secretive with their methods or ideals. </span>
In time a fifth group was added to the cast system-- the untouchables is the correct answer.
The correct answer is "D": The establishment of the Environmental Protection Agency
I just took the test and got 100% Hope this helps