48. Which of the following statements about North Korea is NOT true? (A) North Korean terrorists helped decrease the rent-to-income ratio from 50% to 30%. (B) North Korean navy in late 1960s had successfully attacked and captured a spy ship of the U.S. (C) North Korean army once tried to assassinate the President of South Korea but eventually failed. (D)North Korean agents succeeded in creating terrorist incidents to escalate the tension between the two countries.