What is a characteristic of water-soluble powders in pesticide formulations?

Water-soluble powders in pesticide formulations are designed to be entirely soluble in water, which distinguishes them from other formulation types. This characteristic allows these powders to dissolve completely when mixed with water, creating a clear solution. This property is particularly beneficial for ensuring uniform distribution of the pesticide in the spray solution, enabling effective application and minimizing residue.

While it is true that some formulations may require agitation during mixing to assist the dispersion of solid particles, the defining feature of water-soluble powders is their complete solubility in water, making option C the best answer in this context.