请教大全-11-5，谢谢！
In 1985 the city’s LACE w:st="on">LACENAME w:st="on">FineLACENAME> LACENAME w:st="on">ArtsLACENAME> LACETYPE w:st="on">MuseumLACETYPE>LACE> sold 30,000 single-entry tickets. In 1986 the city’s Folk Arts and Interior Design museums opened, and these three museums together sold over 80,000 such tickets that year. These museums were worth the cost, since more than twice as many citizens are now enjoying the arts.
Which of the following, if true, most seriously weakens the author’s assertion that more than twice as many citizens are now enjoying the arts?
(A) Most visitors to one museum also visit the other two.
(B) The cost of building the museums will not be covered by revenues generated by the sale of museum tickets.
(C) As the two new museums become better known, even more citizens will visit them.
(D) The city’s Fine Arts Museum did not experience a decrease in single-entry tickets sold in 1986.（A）
(E) Fewer museum entry tickets were sold in 1986 than the museum planners had hoped to sell.
请问为什么要选A？参观其中一个的同时参观另一个跟more than twice as many citizens are now enjoying the arts有什么关系？
原文说的是together sold over 80,000，那么不管参观一个参观两个还是三个，together起来确实是more than twice ，因为80000>30000*2 啊，想不通~~~请大家帮忙！谢谢！ | 
