If metal A displaces metal B from its solution, it indicates that metal A is more reactive or possesses a higher reduction potential than metal B. The displacement reaction occurs due to the tendency of more reactive metals to displace less reactive ones in aqueous solutions. This behavior is based on the principles of the activity series of metals. The displacement reaction involves the transfer of electrons, and the more reactive metal effectively reduces the ions of the less reactive metal. This phenomenon is commonly observed in redox reactions and is a useful tool for understanding the relative reactivity of different metals.