To contain the radioactive pollution due to presence of high level of Caesium, which among the following substance was dropped in sandbags into the seawater near the Fukushima Daiichi Nuclear Plant , after the recent disaster in Japan?
[A]Fly Ash

In the aftermath of the Fukushima Daiichi nuclear disaster, sandbags of zeolite were dropped into the seawater near the power plant to adsorb radioactive caesium which was present in high levels. We all have studied that Zeolite is used in the laundry industry, in water purification. However, this wonderful porous material is used also in Petrochemical industry, Nuclear industry, Refrigeration (adsorption) , Construction, Gemstones and so on. Kindly visit wikipedia page of Zeolite and revise these applications.