Answer: B. An experiment should cause no harm to the natural world.
Explanation:
A simultation is a model or substance which can be used to mimic the natural phenomena or event.
According to the given situation, the scientists want to know the impact of crude oil if dumped in Lake Michigan.
Instead of using the original oil the use of simulation is better as it will not exert negative influnece over the environment. As oil is expected to contaminate the water which a simulation will not. The oil will cut the supply of atmospheric oxygen in water hence will affect the life of marine animals.