“The numerous suburbs, covered with parks, gardens, villas and beautiful promenades, and plentifully supplied with rich bazaars, and finely built mosques and baths, stretched for a considerable distance on both sides of the river. In the days of its prosperity the population of Baghdad and its suburbs amounted to over two million!” -Arab historian and biographer, Yakut al-Hamawi, ca. 1000 CE discussing Baghdad during the Abbasid Dynasty

Which of the following is a conclusion that can be drawn when considering the passage above

a
The city became too large to control, which led to warfare and strife
b
Baghdad had a rich economy that supported a large population
c
Yakut is not a reliable source on Baghdad due to the imprecise dates
d
Baghdad was taken over by the Ottoman Turks during the 1200s