JAMB Chemistry 1979 Question 6

When carbondioxide is bubbled into limewater a white precipitate is formed. If the passage of the gas is continued the precipitate disappears. The reason for this is

1. A.calcium carbonate is formed which on reaction dissolves
2. B.calcium hydrogen carbonate is precipitated and then dissolves
3. C.calcium carbonate is formed which on reaction with further carbondioxide forms soluble calcium hydrogen carbonate
4. D.concentration of the solution has occurred with the deposition of calcium hydroxide
5. E.the solution has become saturated and solid carbondioxide has been deposited.