Answer:a. Positive word-of-mouth
Step-by-step explanation:
Positive word of mouth is powerful tool that a business can take advantage of because it is free advertising. It occurs when an acquaintance tells those closest to them about the excellent service or product that they received from a particular company.
Positive word of mouth is effective due to the fact that a business doesn't have to pay for it.
Word of mouth is more reliable because a person get the information from someone they trust the most such as their spouse or friend. A person is likely to purchase something recommended by a friend than the one shown on TV advertisement.
It spreads fast like a virus, the message is passed from one person to another.
It is most remembered and stays longer in one's memory a person is very likely to remember a product that was recommended by a friend than the ones they saw on an advertisement.
It only depends on the business putting it extra effort to impress its customers because if this is not done a bad word of mouth can can also spread like a virus.