Context clues

1. Read the passage then answer the question.

Construction on Florence's grand cathedral began in 1296.Over a hundred year's later; however; the structure remained unfinished; with an enormous hole in the roof. The designers had intended to top the cathedral with the world's largest dome; but this plan was stymied by architectural limitations.The main factor stalling progress was the fact that no one knew how to create such a massive cupola without large; cumbersome support systems. 

What is the meaning of cupola as used in the passage.


1.dome
2.roof
3.decoration
​4.cathedal

1. Yes, dome is the right answer because it's talking about how to create something.
​2.No roof is not the right answer because it talk about something that is not in the text
3.No decor