Administrative expropriation refers to an administrative legal system in which administrative organs compulsorily obtain the right to use or own the property of citizens and legal persons in accordance with the law for public interests and public purposes, and provide them with reasonable compensation.
According to the above definition, which of the following is not an administrative expropriation?
There was a flood in a certain place. In order to fight the flood, the government mobilized sand from several construction companies and gave them a certain amount of compensation