Which of the following is most probably functionally illiterate

A．over one-tenth of American population have difficulty in using and writing skills in everyday situations
B．in North America nation-wide tests are given to test pupils' functional literacy
C．Canadians are generally at a higher level of functional literacy than Americans are
D．teaching of English reading and writing has turned out to be a failure in Canada and the U. S.

A．John and Paul were more talented and made greater contribution to the success of the band
B．John and Paul sang their own songs because they didn't like each other's style
C．George and Ringo never composed or sang their own songs
D．The Beatles maintained so much popularity with their works that no other recording or writing group could compare