Which of the following is most probably functionally illiterate

A．Canada and the U.S. have functionally illiterate population because they hardly paid any attention to the problem
B．functional illiteracy may have been caused at least in part by unsuccessful design of reading tests
C．non-English-speaking immigrant population constitute the majority of all the functionally illiterate
D．it is impractical to determine what functional illiteracy really is as different situations set different requirements

A．analyse different definitions of functional illiteracy
B．discuss the reasons for functional illiteracy
C．compare ways to get rid of illiteracy
D．introduce the problem of functional illiteracy