What attribute allowed for trade to thrive in all three Muslim empires? A. Mass enslavement
B. A wealthy middle class
C. Access to transatlantic sea routes
D. Peace
it might be d

I would guess C

Explanation:

There wasn't any mass enslavement and peace seems like the wrong answer, i know that there was a lot of access to the sea so I think the answer is C, i could be wrong tho.

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

  the common sense as a pamphlet written by thomas paine. it promoted the independence of the colonies from british rule. the distribution of this pamphlet was great, it reached people everywhere and it was even read aloud at places people met. it also unite the colonists before the revolutionary war.

answer is d