According to EPA estimates, homes built between which years have a 25% chance of containing lead paint?

The choice indicating that homes built between 1960 and 1978 have a 25% chance of containing lead paint is based on historical data regarding the use of lead in household paints. The Environmental Protection Agency (EPA) has established that lead-based paints were widely used in homes up until 1978, when the federal government prohibited its residential use due to health risks associated with lead exposure, particularly affecting children.

Homes constructed between 1960 and 1978 are specifically significant because during this period, lead was still commonly used in paints, albeit with growing awareness of its dangers. Thus, the 25% chance estimate highlights the increasing likelihood of discovering lead paint in these homes as compared to those built before 1960, where the chances may be higher, and those built after 1978, where the use of lead paint was banned outright.

Those options that suggest time frames outside of 1960 to 1978 either place the homes in a period where lead paint use was much more prevalent (the earlier years) or well after its prohibition. Therefore, the correct timeframe aligns accurately with the EPA's assessment.