The correct answer should be A: there is no single best career path.
Sure if you want to become an actor you have higher chances if you go to an acting school, for example, but there have been countless examples of non-schooled actors who just went to auditions or who worked as waiters and got seen in a restaurant and were hired. You should always keep your eyes open for all options.
Solid evidence, to be proven guilty
The world saw a major increase in population, which, along with an increase in living standards, led to the depletion of natural resources. The use of chemicals and fuel in factories resulted in increased air and water pollution and an increased use of fossil fuels.