Josh: DVD rentals nationwide together handled 10 million fewer DVD rentals in 2012 than in 2011. The decline in rentals was probably due almost entirely to the February 2012 launch of Webflix, the first and only DVD rental available that, in addition to renting DVDs, also sold them cheaply.
Maxwell: There must be another explanation: as you yourself said, the decline was on the order of 10 million rentals. Yet Webflix sold only 4 million DVDs in 2012.
Which of the following, if true, would most seriously weaken the objection that Maxwell presents to Josh's explanation?