Answer:
B
Explanation:
In precipitation reaction, there is the emergence of a solid settling out of the solution. It can be visualized as a case in which a particular soluble solid becomes insoluble due to its reaction with another substance otherwise tagged as the precipitating reagent
It is thus reagent that draws it out of the solution by making it insoluble in its former solution. Hence it acts like it is calling out the substance by using a precipitating reagent