Which condition would most likely result in increased resistivity?

Increased resistivity in a soil or environment can occur under specific conditions, one of which is dry conditions. When the moisture content in the soil is low, the ability of the soil to conduct electricity diminishes. This is primarily because water acts as a conductor in soil; the presence of water enhances ionic mobility, which facilitates electrical current flow.

When conditions are dry, there is less water available to support this conductivity, leading to a higher resistivity reading. In contrast, high moisture content or high salt content typically lowers resistivity due to the better conductivity provided by water and dissolved ions. Low temperature can also influence resistivity, but it is generally associated with increased resistance due to the reduced kinetic energy of the molecules, making the answer of dry conditions more direct in the context of increased resistivity.