a warning sign of quackery includes: a. offering instant results b. advertisements that make you laugh. c…

a warning sign of quackery includes: a. offering instant results b. advertisements that make you laugh. c. not containing a secret formula. d. all of the above
Answer
Brief Explanations:
Quackery often involves false claims of quick - fix solutions. Offering instant results is a common sign as real - world health or product benefits usually take time. Advertisements making one laugh are not related to quackery signs, and not having a secret formula is not a sign of quackery (in fact, secret formulas are sometimes used in quackery to add an air of mystery).
Answer:
A. Offering instant results