You can infer from the passage that the people who are presently supposed to pay the high est percentage of their income in taxes are the ______.

A．a change in the status of literate people
B．a change in the nature of reading
C．an increase in the number of books
D．an increase in the average age of readers

A．the importance of silent reading
B．the amount of information yielded by books and newspapers
C．the effects of reading on health
D．the value of different types of reading material