The answer is b because the empire made an advance
Answer:
Sankore is a cultural edifice found in Timbuktu, Mali. The Sankore was a mosque which was demolished and rebuilt after some years by Imam Al Aqib.
He gave the instructions because he wanted the mosque to be built in a similar fashion as the Kaaba mosque found in Mecca. The connection and relationship Sankore has with Kaaba is the similar building pattern and structure
Ivan IV created the Russian Empire and brought in architects to rebuild Moscow from foreign countries.