a. true
Explanation:
The "One Thousand and One Nights," also known as "Arabian Nights," is a collection of Middle Eastern folktales with a frame story. The frame story involves Scheherazade, a queen who tells her husband, King Shahryar, a new story every night to avoid being executed. These individual stories, such as "Aladdin" and "Sinbad the Sailor," are woven into the overarching narrative of Scheherazade's storytelling. So, the presence of a frame story is indeed true in the context of "One Thousand and One Nights."
