Final answer:
Around 90% of customers will continue doing business with a company if their complaint is resolved quickly and effectively.
Step-by-step explanation:
The correct answer is option C) 90%.
When a complaint is resolved on the spot, it increases customer satisfaction and loyalty.
Studies have shown that around 90% of customers will continue doing business with a company if their complaint is resolved quickly and effectively.
This demonstrates the importance of customer service in retaining customers and building a positive reputation.