Discuss the rule of law as a democratic principle which supports a democracy under the following headings, its importance

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.

it should be d or b but i'm sure it's d