Final answer:
The reason for the product failure of Kimberly-Clark's Avert Virucidal tissues was the public's fear and mistrust associated with the term 'cidal' in the brand name.
Step-by-step explanation:
The reason for the product failure of Kimberly-Clark's Avert Virucidal tissues was the public's fear and mistrust associated with the term 'cidal' in the brand name. People were frightened by the idea that the tissues could actively kill germs, even though they were designed to do so in a safe and effective manner. This fear caused skepticism and resistance, leading to a lack of belief in the product's claims.