Answer:
They contain murders and other evil things.
Step-by-step explanation:
In the given passage, the speaker talks about how the tale about Harun al-Rashid focuses more on the good deeds he did. Just like Disney movies focus on the fairytale stories of the positive side of a story, modern scholars also focus only on the good deed of the Caliph of the Abbasid dynasty.
But what "not always wholesome" means is that even though many people focus on the good side of the story of Harun, it is not the complete story. Harun did bad things, evil deeds, "murders, black magic," and the like, and all these are not included in this tale.
Thus, the correct answer is the fourth or last option.