Answer:
C) a shallow, sheltered area near an estuary
Step-by-step explanation:
A marsh is a shallow, sheltered area generally found near an estuary. They are often between aquatic and terrestrial ecosystems. Like other marine ecosystems, some marshes experience tides. Therefore, these tidal marshes are exposed during low tide and underwater at high tide. Marshes that are not as close to the coast are called nontidal marshes.
----------------------------------------------------------------------------------------------------------
More information on marshes:
The producers that thrive in marshes are herbaceous, meaning they do not have woody stems. Just like estuaries, marshes are rich in nutrients and are home to an abundance of wildlife.