Which of the following statement(s) is/are true?

1. Inadequate infrastructure does not have multiple adverse effect on the health.
2. Improvement in sanitation has a large impact by reducing morbidity from major waterborne diseases.
3. Improvement in water supply does not reduce the severity of disease.
4. Air pollution and safety hazards connected to transportation also affect morbidity.

B and D only

Infrastructure contributes to economic development of a country both by increasing the productivity of the factors of production and improving the quality of life of its people. Inadequate infrastructure can have multiple adverse effects on health. Improvements in water supply and sanitation have a large impact by reducing morbidity (meaning proneness to fall ill) from major waterborne diseases and reducing the severity of disease when it occurs. In addition to the obvious linkage between water and sanitation and health, the quality of transport and communication infrastructure can affect access to health care. Air pollution and safety hazards connected to transportation also affect morbidity, particularly in densely populated areas.