Management Accounting

Costs are important to customers because?

a)  higher costs means higher product quality
b)  higher costs means higher product service
c)  to the customer, cost means what is paid and customers value lower prices, all other things equal
d)  customers do not want organizations to waste society's resources, which is reflected by higher costs

I believe "c" is the correct answer.  Please advice if correct or not & why.  Thanks!!!!