Which of the following is a source of lead on a firing range?

The correct choice identifies primers, powder, and projectiles as significant sources of lead on a firing range. This is because the ammunition used in firearms typically contains lead or lead-based compounds.

When a firearm is discharged, the primer ignites, which can release lead into the environment, and the projectile, often a lead bullet, directly contributes to lead contamination when it strikes a target or surface. Additionally, the combustion process of the gunpowder can also produce minute amounts of lead particles as byproducts.

In contrast, other options do not serve as primary sources of lead. Steel targets do not contain lead and actually help to reduce lead particulate matter by preventing bullets from fragmenting into smaller lead pieces upon impact. Gun cleaning solvents, while they might have their own set of environmental concerns, do not typically introduce lead into the environment. Therefore, focusing on ammunition components such as primers and projectiles provides a clearer understanding of lead sources in shooting environments.