A company sells hockey sticks. Members of the company's research group would like to estimate the percentage of their customers who are left-handed. They plan to survey a sample of customers. Which method should the members use to select the sample
A. randomly select 45 customers from a list of all customers

B. select the next 45 customers who place an order

C. randomly select 45 customers from a list of customers who have purchased left-handed hockey sticks

D. select the next 45 customers who place an order and are left-handed