There are many forms of indoor air pollution in the modern home and several of these pollutants are dangerous to human health and some can even be toxic. We can categorize Indoor pollutants into two groups, biologic and chemical. When we think of chemical household toxins substances such as cleaners and pesticides, but some chemical toxins are built in: that is, they are an integral part of the house itself. A prominent VOC found in household products and construction products is

A) asbestos.
B) benzene.
C) formaldehyde.
D) radon.