C. used to produce other goods and services
The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
This new tunnel revolutionized transportation in Europe and overcome this physical barrier because the Swiss engineers built the world's deepest and longest tunnel in the world, increasing the effectivity of train freight transportation across Europe.
We are talking about the Gotthard base tunnel, in Switzerland. According to the article "Swiss create the world's longest tunnel," was so complex to build that engineers and workers lasted 20 years to complete. It is a tunnel for trains. It has 35 miles of longitude and crosses the Alpes mountains.
Presidential meetings usually are about classified information, which means that they can be top secret, secret and confidential. Usually, in these presidential meetings matters of national security and defense against terrorism are discussed and if information of these meetings is released to the public national security might be at risk.
Despite this, The Presidential Records Act - created in 1981 - determines the preservation of all presidential records. The Act determines that public access to Presidential records can begin five years after the end of the Administration.
