Two beakers $A$ and $B$ containing pure water and an aqueous solution,respectively,are placed in a closed container. What will be observed gradually with the passage of time?

• A
  Level of water in beaker $A$ becomes lower than the level of solution in beaker $B$.
• B
  Level of water in beaker $A$ and level of solution in beaker $B$ remain constant.
• C
  Level of water in beaker $A$ increases and that of solution in beaker $B$ decreases.
• D
  Level of both the beakers increases.