Respuesta :
Answer:
the answer is C. inhalation
Explanation:
there are four routes by which a substance can enter the body: inhalation, skin (or eye) absorption, ingestion, and injection. Inhalation: For most chemicals in the form of vapors, gases, mists, or particulates, inhalation is the major route of entry
Answer:
Inhalation.
Explanation: For it to get to the airways, you have to inhale it.