The correct option is C water hyacinth
Water hyacinth is a very rapidly growing weed. It was introduced in India because of its beautiful flowers and the shape of leaves. However, it drained the oxygen from the water, which led to the death of fishes. This coupled with the fact it can propagate vegetatively at a phenomenal rate and spread all over the water body in a short period of time, makes it a very troublesome organism.
Pistia stratiotes is the scientific name for water lettuce. It is often referred to as water cabbage as well.