Final answer:
There are 7 established Ismaili Centers located in London, Dubai, Lisbon, Vancouver, Dushanbe, Houston, and Toronto. They serve as important spiritual and cultural hubs for the Ismaili community.
Step-by-step explanation:
The question you have asked relates to the number of Ismaili Centers that are established around the world. The correct answer is b) 7 centers; these are located in London, Dubai, Lisbon, Vancouver, Dushanbe, Houston, and Toronto. Each Ismaili Center serves as a spiritual and cultural hub for the Ismaili community in their respective regions, providing a space for worship, reflection, and exchange of ideas rooted in the Ismaili and Muslim traditions.