A Firm Finds That 50% of the Target Market Is

A firm finds that 50% of the target market is exposed to a marketing communication,40% of that group is aware of the offering,80% understand the message.WIthin that group,60% intends to purchase,and 70% of that group actually does purchase.The customer response index is 6.7%.What is the difference in the value of the customer response index if 80% of the group intends to purchase and 60% of that group actually does purchase?

A) 0%
B) 1%
C) 2%
D) 3%
E) 4%