The term terror of Bengal is used for

Explanation:

• Eicchornia crassipes is a free-floating perennial hydrophyte.
• It is commonly known as water hyacinth and is indigenous to tropical and subtropical South America.
• Eicchornia crassipes is a rapidly growing aquatic plant and is an invasive species.
• It reproduces by runners and stolons and produces thousands of seeds annually, remaining viable for 28 years.
• Eicchornia crassipes was proposed in Bengal for its beautiful flowers.
• But it evolved into an invasive weed depleting oxygen from the water bodies and culminating in many fish deaths.
• Fish scarcity was caused in Bengal due to the Eicchornia crassipes.
• As fish is Bengal's supplement food, Eicchornia crassipes has been termed the 'terror of Bengal'.

Final Answer:

Hence, the correct option is B: i.e. Eicchornia crassipes.