Which section of the MSDS details the routes of entry of a hazardous material?

Answer: B — Health hazards of the material

The correct choice is the section detailing the health hazards of the material because this portion of the Material Safety Data Sheet (MSDS) specifically addresses how a hazardous material can affect individuals upon exposure. It covers the potential routes of entry into the body, which include inhalation, skin contact, ingestion, or injection. This information is crucial for understanding how a substance may pose health risks and is essential for formulating appropriate safety protocols and first aid measures. The other sections, while important, do not focus specifically on the routes of entry. First aid measures outline how to respond to exposure but do not explain how the substance can enter the body. Environmental hazards focus on the material's impact on the environment rather than human health. Handling and storage provide guidelines for safely dealing with the substance but do not address direct health impacts or routes of exposure.