What was the main purpose of the house of wisdom

the answer is D.(To translate literature into Arabic)

Explanation: The house of wisdom was established by Abbasit Caliphate in Baghdad firstly by caliph Harun al rashid as a private collection of Arabic and Persian poetry which eventually became a public academy during the reign of Al mamun and Al Mansur. Although many think that it was created for arabic poetry but it really existed for the major translation movement which taken place at that time. Different works from Greek and Syrian were translated into Arabic with the co operation of the house of wisdom.

So it is more likely that the purpose of the house of wisdom is option D.

the structure was most likely used for;

c. playing a ball game with stone hoops