The correct option is
D They are formed due to tides
They are formed due to tides,
Tidal or Mangrove forests:
Tidal forests grow near the estuaries or the deltas of rivers, swampy margins of Islands and along sea coasts. The soil is formed of silt, silt-loam or silt-clay and sand. The plants are typical halophytes which are characterised by presence of prop roots with well developed knees for support and pneumatophores and viviparous germination of seeds.
Tidal forests one distinguished into the following four types with overlapping constituent species:
(i) Tree mangrove forests
(ii) Low mangrove forests,
(iii) Salt water forests and
(iv) Brackish water forests.