Office Bargains sells 20 pens for $8.50 or 30 pens for $12.50. Which of the following statements is correct? OA) Buying 20 pens and buying 30 pens is equally as good because the unit prices are the same. OB) The 20-count offer would be a better buy because it has the lower unit price. O c) The 30-count offer would be a better buy because it has the lower unit price. O D) The 20-count offer would be a better buy because the cost per pen is less than the cost per pen with the 30-count