Poor sanitation and lack of access to clean water are examples of the effect of
[]lack of knowledge and education.
[]limited health care spending.
[]limited infrastructure.
[]environmental factors.

The right answer is limited infrastructure.

A developed country needs a well-organized infrastructure as a result of water supply, sewerage, educational measures, control of animals and insects, disease prevention, quality of life improvement, garbage collection. All this is part of basic sanitation, a set of measures that aim to preserve or modify the conditions of the environment to prevent diseases and promote health, and as a consequence of the lack of basic sanitation is the impact on the environment. Dumping untreated sewage can pollute soil, groundwater and water supplies, leading to animal death and reducing the amount of drinking water available. The damage can extend to agriculture, commerce, industry, tourism and other sectors of the economy.

where's the