The cancellation of a pesticide product registration results in which of the following consequences?

The cancellation of a pesticide product registration does not result in an immediate cessation of all uses or the destruction of existing stocks. Instead, there are usually provisions that allow for continued use of the product under specific regulatory conditions. This typically means that while the product cannot be sold, existing stocks may still be used in line with restrictions laid out by regulatory authorities. Such restrictions often include adhering to existing label instructions or using the product for specific approved applications as long as they align with safety and environmental regulations.

In contrast, the other choices imply more absolute actions—such as destruction of stocks, complete prohibition of sales, or a definitive end to all uses—which do not align with how pesticide regulation processes usually operate upon cancellation. The focus is typically on managing existing inventories while safeguarding public health and the environment, rather than enforcing an outright ban without any allowances for existing products.