Which of the following is a characteristic of granules?

Granules are solid particles that can vary in shape and size, which is a key characteristic that sets them apart from other formulations like liquids or dust. Their physical composition allows them to provide advantages in application and effectiveness, depending on the specific usage. For instance, the shape of granules can influence how they disperse in the soil and help them adhere to plant surfaces.

Additionally, granules' performance can be influenced by environmental conditions, such as humidity. High humidity may cause granules to break down or dissolve at different rates, affecting their efficacy in herbicide application. Understanding this characteristic is crucial for applicators to ensure proper application timing and method, optimizing the effectiveness of the herbicide.

Other options do not accurately describe granules. They are not typically used in liquid form, as granules are a dry formulation. While granules can vary in weight, they are generally not lighter than dust formulations, as dusts are typically finer and can disperse more easily in the air. Furthermore, granules usually contain a lower percentage of active ingredient compared to concentrated formulations, usually well below 50%. Therefore, the unique characteristic that granules can differ in shape and be affected by humidity makes option C the most accurate choice.