Online, it is easy to think of communication as computer to rather than to .
a. person, computer, person
b. computer, person, computer
c. person, person, person
d. computer, person, person

d. computer, person, person

Explanation:

The correct sentence would be:

"Online, it is easy to think of communication as computer to computer rather than person to person."

That happens because, online, conversations are rarely personal and most of the times they are just letters on a screen. The human part of the interaction is many times unseen or forgotten.

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.