Which combination lists the four pathways by which hazardous materials can enter the body?

Which combination lists the four pathways by which hazardous materials can enter the body?

• A. Inhalation, ingestion, absorption, and contact with the skin.
• B. Inhalation, ingestion, absorption, and ocular exposure.
• C. Inhalation, ingestion, injection, and absorption.
• D. Inhalation, dermal contact, ocular exposure, and ingestion.

Answer: (C)

Understanding exposure routes: hazardous materials can enter the body mainly through inhalation, ingestion, absorption through the skin, or injection. The option that lists inhalation, ingestion, injection, and absorption covers all four entry points—breathing in vapors, swallowing, skin contact with absorption, and puncture-based entry. This pairing specifically includes both dermal absorption and injection, which are distinct routes, whereas ocular exposure is a valid concern but not one of the standard four entry pathways used for this question. Therefore, this combination correctly represents the four primary ways hazardous materials can enter the body.

Understanding exposure routes: hazardous materials can enter the body mainly through inhalation, ingestion, absorption through the skin, or injection. The option that lists inhalation, ingestion, injection, and absorption covers all four entry points—breathing in vapors, swallowing, skin contact with absorption, and puncture-based entry. This pairing specifically includes both dermal absorption and injection, which are distinct routes, whereas ocular exposure is a valid concern but not one of the standard four entry pathways used for this question. Therefore, this combination correctly represents the four primary ways hazardous materials can enter the body.