Answer;
The correct answer would be option C.
<em><u>Didymosphenia geminata</u></em> or didymo is a diatom species that grows rapidly in the freshwater and deprive the nutrition out of it. It spreads like invasive species and its growth threatens the freshwater population.
It can spread in water bodies due to the activities of human in and out of the water bodies.
To prevent the spread of this freshwater pest one must follow the check, clean and dry methods.
Check and remove all the plant matter or any clump from the water gear and put it on the riverbank.
Clean the water gear thoroughly with any one of the following hot water, household bleach, disinfectant, or dishwashing detergent, antiseptic cleaner.
If cleaning is not possible then completely dry the item completely and wait for an additional 48 hours before entering into another water body.
