To Gauge Website Stickiness, a Company Monitors

To gauge website stickiness, a company monitors

A) the average time it takes customers to make a purchase from the time they log on to a website to the time they log off.
B) the average time it takes for customers to move from one page of a website to another.
C) the amount of time per month, in minutes, visitors spend on a company's website.
D) the number of visits by a unique customer to the same website before an actual purchase is made.
E) the total time, in hours and minutes, that it takes for a customer to make an online purchase.