Which freshwater source is a permanent shallow body of water with plant life throughout?

Answer: it is c

Fresh water has a variety of different sources on Earth which includes rivers, lakes, streams, rain water, etc.

One of the fresh water sources is a Lagoon which is a permanent shallow body of water which is separated from the larger water bodies by a natural barrier such as reefs or islands.

Reportedly, almost 311 plant species are found to be grown in the Atanasovsko Lake lagoon, out of which the Marsh samphire, reed, vicia and sea wormwood are a few to name.