Answer:
Letter A is correct. Skyscrapers.
Explanation:
In this matter the ideal alternative is Skyscraper. This structure is more used for the service sector as the examples mentioned in the question: finance and insurance companies.
This strategy of locating service companies close to central areas is justified by the high concentration of the target audience of the companies, in addition to the benefit of the skyscrapers being made on a small part of the land and can accommodate many people.