Mother tounge is basically just the language from your culture.
Explanation:
When somebody says something is in their "mother tounge" it means it is in their native language. For example, "The Sioux man recited a poem in his mother tounge, his face alight with passion."
"<span>d. Because one of the witches' prophecies has come true" would be the best option from the list, since it is the witch's ideas and warnings that are often most feared in this tale. </span>