If a product label is destroyed or damaged, which of the following does not need to be marked on the container?

The requirement to mark certain information on a container is determined by regulatory standards that ensure the safe handling and use of pesticides. In this case, the correct choice is that the percentage of inert ingredients does not need to be marked on the container if the product label is damaged or destroyed.

Inert ingredients, while they play a role in the formulation of pesticides, are typically not as critical for the end-user to know in terms of safety or efficacy compared to active ingredients. The concentration of active ingredients is essential as it directly impacts the effectiveness of the pesticide and is vital for proper application. Similarly, the manufacturer's name is important for identification and accountability, and the expiration date is crucial for ensuring that the product is within its usable life for effective performance.

The information about inert ingredients is regulated but does not have the same level of scrutiny as active ingredients, hence it is acceptable that this particular information may not need to be specified on the container when the product label is damaged.