Final Answer:
In Ottoman architecture, a complex of buildings centered around a mosque, such as the site of the Suleyman the Magnificent Mosque in Istanbul, is referred to as b) Külliye
Step-by-step explanation:
In Ottoman architecture, a complex of buildings centered around a mosque is referred to as a "Külliye."
A külliye typically includes not only the mosque but also various structures such as schools (medrese), a hospital (darüşşifa), public kitchen (imaret), and charitable facilities.
This comprehensive complex serves various communal and social functions, contributing to the holistic development of the community around the mosque.
Therefore, the correct answer is b) Külliye.