The correct options are
C <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
Oral literature
D <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
Written literature
Literary sources consist of both written literature and oral literature. These are usually folktales, lavanies, and literature written by foreign and native authors. Ballads, myths, and legends were also literary sources, and these were passed on through word of mouth, and are a part of oral literature.