Idon't know the answer can you tell me?

answer; i believe that the correct answer is (d); // supercontinent

dont understand question can you makeit more better

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.