Mark the letter A, B, C or D to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 13 to 17.

a. Without immediate action, however, these linguistic treasures could disappear forever, taking centuries of heritage with them.
b. Efforts to preserve endangered languages, such as offering them in school curriculums, have shown promise in revitalising interest.
c. Many minority languages are under threat due to the increasing dominance of global languages like English and Spanish.
d. In some regions, younger generations are opting to speak more widely-used languages, leaving the traditional ones to fade.
e. The loss of these languages also means losing unique cultural identities and traditional knowledge passed down through generations.