Where is arsenic found naturally?

• A. Plywood, particle board, and veneer
• B. Waste batteries, paints, and motor oil
• C. Fire retardants, ceramics, electronics, and solder
• D. Foods, tobacco, shellfish, and drinking water

Answer: (D)

Arsenic occurs naturally as part of the Earth's crust, so it shows up in the environment in water and food. In groundwater, minerals release arsenic, which can lead to measurable levels in drinking water. It also accumulates in certain foods and organisms; shellfish can contain arsenic from seawater, and some crops uptake arsenic from soil and irrigation water. Tobacco plants can absorb arsenic, and exposure can come with tobacco use. Because of these natural pathways, foods, tobacco, shellfish, and drinking water represent the typical natural contexts where arsenic is found. The other options point to sources that involve human use or treatment rather than natural occurrence.