Idk but i know it is not <span>D. <span>Several countries have authoritarian dictatorships.</span></span>
The answer is B) one-third
So, first of all let me explain the process of hydration to you.
The water causes the hardening of concrete through a process called hydration. Hydration is a chemical reaction in which the major compounds in cement form chemical bonds with water molecules and become hydrates or hydration products.
Considering this information, the answer is D.
11.86 Earth years or once every 4,330.6 Earth days