The newly hired public health nurse understands that which of the following best describes the purpose of local health departments making unannounced inspections of local restaurants?

The correct answer is D: To ensure compliance with food safety regulations. Unannounced inspections are conducted to verify that restaurants are following food safety guidelines and regulations to prevent foodborne illnesses. This helps protect public health by ensuring that proper food handling, storage, and preparation practices are being followed. Choice A is not specific enough and does not address the main purpose of the inspections. Choice B is related but does not focus on the specific aspect of food safety. Choice C is not the primary purpose of these inspections.