Which pesticide solution is most likely absorbed through the skin?

Oil-based pesticide solutions are most likely to be absorbed through the skin because the lipid (fat) nature of oil allows these solutions to penetrate the skin's lipid barriers more effectively than aqueous-based solutions. The skin is composed of a hydrophilic outer layer that can restrict substance absorption, while oils can dissolve and carry active ingredients that might otherwise remain on the skin's surface.

Aqueous-based solutions tend to be water-soluble and have a lower absorption rate through the skin compared to oil-based formulations. Granular and powder-based pesticides are typically less likely to be absorbed through the skin due to their solid form and larger particle size, making it more difficult for them to penetrate the skin's barrier. Thus, in terms of dermal absorption, oil-based pesticides present a greater risk, making them the correct answer.