Martha has determined that along the share-development path, her business should perform at a 91% level of product awareness, 73% in product preference, 86% in intentions to purchase, and 76% in product availability

If the share potential index for Martha's business is 26%, at what level of purchase rate should her business perform?
A) 90%
B) 80%
C) 70%
D) 60%
E) 50%

D