Which of the following formulations is known for requiring agitation during mixing?

The correct answer reflects the fact that both solutions and emulsifiable concentrates require agitation during mixing to ensure a uniform distribution of the active ingredients throughout the carrier.

Solutions are composed of solutes that are fully dissolved in a solvent, and while a well-prepared solution may not require ongoing agitation, some formulations or concentrated products can benefit from stirring to achieve optimal mixing initially.

Emulsifiable concentrates are designed to mix oil and water-based components. These formulations can separate over time if not agitated properly, which is critical to maintain homogeneity. Therefore, constant agitation is often necessary during the mixing process to keep the emulsion evenly distributed and to prevent settling.

Granules, on the other hand, are solid formulations that do not require the same kind of stirring or shaking because they do not rely on liquid mixing for their effectiveness. Thus, while granules can be mixed into a carrier, they do not demand the same level of agitation as solutions and emulsifiable concentrates.

In conclusion, both solutions and emulsifiable concentrates necessitate agitation during mixing to ensure effective and even application of the active ingredients, making this option the most accurate choice.