Explanation
Blue Baby Syndrome, also known as methemoglobinemia, is primarily caused by high levels of nitrates in drinking water. Therefore, the correct option is (D) Nitrates.
Nitrates are compounds that can be found naturally in the environment, but they are also commonly introduced into water sources through agricultural runoff, industrial waste, and wastewater. When infants consume water with elevated nitrate levels, the nitrate compounds can interfere with the ability of their blood to carry oxygen. This can result in a condition called methemoglobinemia, where the affected individuals may develop a bluish discoloration of the skin, lips, and nails due to the lack of oxygen in the blood.
It's important to note that excessive exposure to other contaminants like arsenic, chromium, or chlorides can also have adverse effects on human health, but they are not directly associated with causing Blue Baby Syndrome.
