The year asbestos use in residential construction largely ended is approximately:

• A. 1970
• B. 1960
• C. 1980
• D. 1990

Answer: (C)

The main idea here is how health concerns and regulation changed building practices. Asbestos was once common in many residential products—insulation, fireproofing, floor and ceiling materials, roofing, and cement products. In the 1970s, regulators tightened controls on asbestos-containing materials and manufacturers phased them out for new homes. That shift happened quickly enough that by around 1980, the use of asbestos in new residential construction had largely ceased. A federal ban and stricter rules came later, reinforcing a trend that was already well underway by 1980. Years earlier than this were before the regulatory push, while later years reflect ongoing restrictions rather than the practical transition already in place by 1980.