What is the purpose of a wetting agent with regard to pesticides?

Wetting agents, also known as surfactants, are substances added to pesticide formulations that reduce the surface tension of water. This allows the pesticide to spread more evenly across plant surfaces, increasing its coverage and effectiveness. Option A is incorrect because it defines annual plants, not wetting agents. Option C is incorrect because it refers to a different type of application device. Option D is incorrect because it describes a different type of plant.