45. From the charts, which is true?
(A) In 1980, less than 10% of young Navajos could speak only English.
(B) In 1990, less than 30% of young Navajos could speak their native language.
(C) In 1992, more than 70% of Navajo children under six could speak English well.
(D) In 1992, more than 30% of Navajo children under six could speak both Navajo andEnglish well.