The sequence of communities of primary succession in water is:
a. phytoplankton, sedges, free-floating hydrophytes, rooted hydrophytes, grasses and trees.
b. phytoplankton, free-floating hydrophytes, rooted hydrophytes, sedges, grasses and trees.
c. free-floating hydrophytes, sedges, phytoplankton, rooted hydrophytes, grasses and trees.
d. phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow and trees.