Answer:
Correct answer is B. blend elements of local cultures.
Explanation:
Option A is not correct as international trade between the continents of the Old World was pretty much developed. And the Muslim empires developed this.
Option B is correct as they wanted to adopt the previous cultures to their religious beliefs.
Option C is not correct as science, especially math was developing on this period.
Option D is also correct because local cultures were not prohibited. Everyone had opportunity to present his own beliefs.