It's D.
Many alchemists wanted to create the sorcerers stone (creates gold according to a legend).
They studied ores to find out more about the world.
Plus, they also wanted to cure diseases with their practice. (To this day you see stone therapy, which is said to be beneficial for your health)
Pennsylvania passed the first antislavery law
Answer:
c more highly skilled workers were needed.
Well, we discovered that we needed to upgrade security so that potential criminals weren't coming into our country, and so potentially harmful substances weren't being brought onto our planes. That meant literally anything that could become a bomb, start a fire, stab someone etc. As for Pearl Harbour, I think that had more of an affect on how we thought our military and defence system was working.
