Special steel that won’t crack is an example of
a. russian imports
c. russian exports
b. russian adaptation to extreme heat
d. russian adaptation to extreme cold

The answer would be : D. Russian adaptation to extreme cold

If a steel is exposed to an extreme low temperature over prolonged period of time, the structural form of the steal could be damaged, which could lead to a destruction of a building's foundation. In order to prevent this, a country which extreme winter such as Russia developed a special steel that won't crack.