b. This study is not well designed because formulas A and B are not compared with the original formula is the best descriptionfor this study
Explanation:
This study was mainly conducted to know about the customer's preference for a new formula of corn chips which related with the original formula ., whether the customer's like the new formula than the old one.,so the company must include the old formula along with the two new formula's for customer's consideration. But .,Here they introduced and tested only the new formula's.,
So.,
Comparison of all the three formulas is must., to know about the exact preference of customer's on new formula's than the old formula.,so option b is preferable