According to the video, "Investors Help Bring Sanitation to Kenya's Poor," which of the following statements is true about investing in sanitation?

Answer Options:

a. Sanitation is an important system to invest in because the cost of not investing is disease and death within the population.

b. The benefits of sanitation are negligible and not worth making a behavior change.

c. Sanitation does not improve people's hygiene or their health, but it has a good economic return on investment.