A pesticide chemical almost always has to be combined with which of the following to make a usable form?

The correct choice is that a pesticide chemical almost always has to be combined with diluents, solvents, wetting agents, and stickers to achieve a usable form. Pesticides typically require some form of formulation to enhance their effectiveness, stability, or ease of application.

Diluents and solvents are used to dissolve or disperse the active ingredient, allowing it to be applied in a more controlled manner. Wetting agents help improve the spread and adhesion of the pesticide to the target surfaces, which ensures better coverage and reduced runoff. Stickers are additives that promote the longevity of the pesticide on surfaces by reducing wash-off due to rain or irrigation.

This combination is essential for creating a product that not only works effectively but is also safe and convenient for users to apply. Other options, which suggest limiting the formulation to only certain components, do not encompass the full range of necessary additives that facilitate the effective application of pesticides.