Among the most effective ways to increase sales of an online service is to offer some form of free trial for users to experiment with before they purchase the full service. The benefit of such a practice is to encourage sales in individuals who would not buy the product without having tried it first. Which of the following is best supported by the information given above?
A. The number of people who see the free trial as an acceptable replacement for buying the online service is not greater than the number of people who buy the online service because of their experience within the free trial.
B. Because the cost of offering a free trial can be high, companies are often resistant to offering free trials, especially free trials that offer all features included within the paid version of the online service.
C. In calculating the total number of an online service sold, free trials are generally included as zero-dollar sales rather than as a separate category.
D. The number of sales for a given online service is directly proportional to the number of visitors to the online service's website, a number that tends to increase if a free trial is offered.
E. Online services that are easily adapted to free trial versions sell better than do online services that are not readily distributed as free trials.