Why did the abbasids make changes to the arab muslim empire? ?

The Abbasid regime made changes int he former era in order to build a nation based on the equity of all Muslims.  The new leaders opposed the extensive military victories in stopping the dominance of the Arab military class.  They ended hatred against non - Muslims and made Islam a stronger diverse religion.   The Abbasid also shifted the center from Damascus to Baghdad, a tiny market city on the shores of the Tigris river.

where's the

hello, your actual correct answer is c. taxes.

factories are actually the second biggest but on your optian list its taxes.