Over the last 3 months, the average time spent by visitors on the Zapto homepage that links to a collection of other useful websites has steadily gone up by 15%. During this time, the time required to access Zapto’s home page has gone down by 25%. Therefore, the reduction in time required to access the home page must have led to visitors spending more time on that page.
Which of the following, if true, casts the most serious doubt on the conclusion drawn above?
A. The overall World Wide Web traffic increase by 15% in the past 3 months.
B. The enhancements that Zapto made to its home page has still not made the home page as fast as its direct competitor's.
C. The list of websites accessible from Zapto’s home page gets updated every week.
D. A live stream of Zapto’s popular and well received TV programming has been recently made viewable from Zapto’s home page.
E. Surveys show that Zapto’s customers are no more satisfied with the layout of the home page now than they were 3 months ago.