An example of a misbranded manufacturer's container of a drug would be if:

The correct choice highlights a significant aspect of what constitutes a misbranded drug under federal law. A manufacturer’s container of a drug that does not list the quantity of the contents is deemed misbranded because it fails to provide essential information that consumers and healthcare providers require for safe and effective use of the medication. The quantity of the drug is critical for dosage calculations and ensures that patients receive the correct amount of medication, which is vital for efficacy and safety.

While other factors like lacking a label or having misleading information also indicate issues of misbranding, they do not directly pertain to the essential quantity information that is necessary for proper drug usage. An incomplete expiration date may create ambiguity about the product's safety, but it does not specifically address the fundamental requirement of labeling that ensures consumers know how much medication they are receiving. Therefore, the lack of clear quantity information is a direct violation that qualifies the drug as misbranded under the law.