I think the answer is c. gerund
The speaker talks about the <span>humankind's relationship to both God and His creation as something positive and driven by knowledge. He talks about how knowing more about the world lets you know more about the works of God. He also talks about not really studying God as He is and His reasons because that is impossible.</span>
Yes, because they’re arguing that if you don’t want to get sick, simply wash your hands.