After a heavy rainfall and the formation of a large pond, the most likely sequence of changes in the vegetation of the pond is

• A.Euglena → water lily → Spirogyra → grass
• B.water lily → Spirogyra →grass → Euglena
• C.Spirogyra → Euglena → grass → water lily
• D.Euglena → Spirogyra → water lily → grass
• E.