The correct answer is (a) Sydney.
Sydney was named the safest city in the world in the Safe Cities Index 2021 released by the Economist Intelligence Unit (EIU). The index ranks 60 cities based on their performance across 76 indicators grouped under three categories: digital security, health security, and infrastructure and personal security.
Sydney scored highly in all three categories, particularly in digital security and infrastructure and personal security. It was ranked first in the world for digital security, with a score of 97.7 out of 100. It was also ranked first in the world for infrastructure and personal security, with a score of 97.6 out of 100.
The other cities in the top 10 were Tokyo (2nd), Singapore (3rd), Osaka (4th), Melbourne (5th), Amsterdam (6th), Wellington (7th), Zurich (8th), Toronto (9th), and Copenhagen (10th).
The Safe Cities Index is a valuable tool for businesses and individuals who are looking for information on the safety of cities around the world. It can help them make informed decisions about where to live, work, and travel.