The correct answer is C. nitrous oxide.
Nitric oxide (NO) is a colorless, odorless gas that is produced by the body. It is a signaling molecule that plays a role in many physiological processes, including blood pressure regulation, inflammation, and the immune response.
Nitrogen dioxide (NO2) is a reddish-brown gas that is a major air pollutant. It is formed when nitric oxide reacts with oxygen in the air. Nitrogen dioxide is a respiratory irritant and can cause inflammation of the lungs.
Nitrogen peroxide (N2O4) is a colorless, odorless gas that is a strong oxidizer. It is used in rocket fuel and explosives.
Laughing gas is a common name for nitrous oxide (N2O). It is a colorless, odorless gas that is used as an anesthetic and analgesic. It is also used as a recreational drug. Nitrous oxide is a central nervous system depressant that produces a feeling of euphoria and relaxation. It can also cause hallucinations and impaired judgment.