问题：

[单选] Which statement is true？（）  

A .  A flow layout can be used to position a component that should resize horizontally when the  container is resized.
B .  A grid layout can be used to position a component tat should maintain a constant size even when  the container is resized.
C .  A border layout can be used to position component that should maintain a constant size even when  the container is resized.
D .  The grid bag layout can be used to give a grid-like layout which differs from the normal grid in that individual rows and columns can have unique sizes.
E .  If two components are placed in the same column of a grid bag layout， and one component resizes horizontally， then the other component must resize horizontally.