Correct option: (b)
Explanation:
Water hyacinth "** of Bengal" is an aquatic plant which is one of the most invading weeds found growing in the standing water. It is also called as "blue ' as it takes oxygen from the water which causes of fishes. This plant was introduced in India for its beautiful flowers and shape of leaves. It can propagate vegetatively at a fast rate and spread all over the water body in a short time. It is very difficult to remove it from the water body.
