What does "readily biodegradable" mean in the context of herbicides?

The term "readily biodegradable" in the context of herbicides refers to the ability of a substance to break down quickly into non-toxic components through natural biological processes. When a herbicide is labeled as readily biodegradable, it implies that, once released into the environment, it will decompose rapidly by the action of microorganisms, such as bacteria and fungi. This rapid breakdown reduces the likelihood of prolonged environmental contamination and minimizes harmful impacts on ecosystems.

In contrast, options that suggest the herbicide lingers in the environment or leads to immediate plant death do not align with the characteristics of a readily biodegradable substance. Additionally, claiming that the herbicide is safe for all wildlife isn't accurate; while biodegradability may suggest lower environmental persistence, it does not inherently signify safety to all forms of life. Thus, option B most accurately conveys the essence of what "readily biodegradable" means regarding herbicides.