11. The average cable television company offers its customers 50
channels, but new fiber-optic lines will enable telephone companies
to provide 100 to 150 television channels to their customers for
the same price as cable companies charge for 50. Therefore, cable
companies will be displaced by the new companies within a few
years.
Which of the following, if true, most helps to strengthen the
argument?
(A) The initial cost per household of installing new fiber-optic
television service will exceed the current cost of installing cable
television service.
(B) The most popular movies and programs on channels carried by
cable companies will also be offered on channels carried by the
fiber-optic lines owned by the telephone companies.
(C) Cable television companies will respond to competition from the
telephone companies by increasing the number of channels they
offer.
(D) Some telephone companies own cable companies in areas other
than those in which they provide telephone services.
(E) The new fiber-optic services offered by telephone companies
will be subject to more stringent governmental programming
regulations than those to which cable companies are now subject.
答案是B，我觉得C更对阿
我看解释更是云里雾里 | 
