Final answer:
To stop false advertising, the mouth and gums rinse firm can provide scientific evidence, conduct independent tests, issue a public apology, retract false advertising, and face legal consequences if necessary.
Correct option is 4.
Step-by-step explanation:
False advertising by a mouth and gums rinse claiming to kill germs over a long period of time can be stopped through a combination of measures:
- Providing scientific evidence that supports the claim of germ-killing properties.
- Conducting independent tests to verify the claim and ensure its accuracy.
- Issuing a public apology and retracting the false advertising if it has already been disseminated.
- Finally, the firm may face legal consequences for false advertising if the claims are found to be intentionally deceptive.