Which prevents self pollination

Large, colourful, fragrant flowers with nectar are seen in

Type of pollination in commelina is

Identify the set of correct statements:

$A$. The flowers of Vallisneria are colourful and produce nectar.

$B$. The flowers of water lily are not pollinated by water.

$C$. In most of water-pollinated species, the pollen grains are protected from wetting.

$D$. Pollen grains of some hydrophytes are long and ribbon like.

$E$. In some hydrophytes, the pollen grains are carried passively inside water.

Choose the correct answer from the options given below.