Step 1: Concept
Medicated powders can be applied externally or internally to various parts of the body.
Step 2: Meaning
Specific terminology is used for powders based on their site of application and method of delivery.
Step 3: Analysis
Dusting powders are for external skin application. Insufflations are fine powders designed to be blown into body cavities (like the nose, throat, or ears) using a device called an insufflator.
Step 4: Conclusion
Hence, powders introduced into body cavities are termed insufflations.
Final Answer: (B)