In the following which plant is also called 'Terror of Bengal'?

Eichhornia

The correct answer is Option (2) – Eichhornia

Eichhornia crassipes( water hycinth) also called "Terror of Bengal" due to its rapid proliferation as an exotic shrub on water surfaces. This growth impedes the development of fish and other aquatic life by reducing light penetration and oxygen levels. Eichhornia was introduced for its beautiful foliage and flowers from South America to Indian waters to reduce pollution , including wetlands at many places resulting in death of several aquatic plants and animals but it has now become a weed covering the entire surface of the water body and preventing the growth and development of organisms below.