Question

read gwens topic sentence for a paragraph: first of all, skyscrapers take a lot of time to build. which supporting detail should gwen use? for example, the empire state building in new york took a little over a year to build. skyscrapers are expensive to own since they use a lot of electricity and other utilities. there are many types of amazing architecture created by different cultures.

Explanation:

The topic - sentence is about the time it takes to build skyscrapers. The first option gives an example of a skyscraper (the Empire State Building) and the time it took to build, which supports the topic - sentence. The second option is about the cost of owning skyscrapers, and the third option is about different types of architecture, neither of which is related to the time of building skyscrapers.

Answer:

For example, the Empire State Building in New York took a little over a year to build.