Mark the letter A, B, C or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.
The number of illiterate adults in mountainous and remote areas in Vietnam has declined over the last few years.
A. inflexible
B. unable to pass an exam in reading and writing
C. able to read and write
D. able to join intramural sport