Both Writewell and Express provide round=the-clock telephone assistant to any customer who uses their word-processing software. Since customers only call the hotlines when they find the software difficult to use, and the Writewell hot receives four times as many calls as te Express hot line, Writewell's word-processing software must be more difficult to use than Express's. Which of the following, if true, most strengthens the argument above?
A Calls to Express hto line are almost twce as long, on average, as are calls to the Writewell hot line.
B Express has three times the number of word-processing software customers that Writewell has.
C Express receives twice as many letters of complaint about its word-processing software as Writewell receives about its word-processing software
D The number of calls received by each of the two hot lines has been gradually inceasing
E The Writewell hotline number is more widely publicized than the Express hotline number.
正确答案是B
我选A
Please help to give the reason of the correct choice | 
