Respuesta :
The answer would be A because the definition of quackery is, “dishonest practices and claims to have special knowledge and skill in some field, typically medicine.” This does not fit B, or C, and D says all of the above so we know it’s not that, ruling out everything else: we know it has to be A
A warning sign of quackery is represented by providing an offer of instant results.
Option A is the correct answer.
What is an advertisement?
Advertisements are the commercials that are being advertised by the companies in order to promote their products.
Quackery refers to the promotion of unhealthy or fraudulent products. it consists of claiming instant results by offering some kind of product that can be harmful to the health of a person. It is a deliberate act of misrepresentation relating to medical products.
Therefore, the offer of instant results is one of the warning signs of quackery.
Learn more about the quackery in the related link:
https://brainly.com/question/18441331
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