Answer:
Constructing this new state-of-the-art swimming facility will take two years.
Step-by-step explanation:
The phrase state of the art refers to the highest level of development of a product. Products described as state-of-the-art are based on the newest technology. When this phrase is used as an adjective, it's written with hyphens between words - state-of-the-art.
The correct way to revise the last two sentences is: Constructing this new state-of-the-art swimming facility will take two years.
The second and fourth options are incorrect because it is the swimming facility that will be state of the art, not the construction.
The third option is incorrect because the duration of the construction is not precisely stated.