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单项选择题 11. rbo = new ReallyBigObject();  12. // more code here  13. rbo = null;  14. /* insert code here */  Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward recycling the memory used by the object rbo?() 

A、 System.gc();

B、 Runtime.gc();

C、 System.freeMemory();

D、 Runtime.getRuntime().growHeap();

E、 Runtime.getRuntime().freeMemory();

  • A
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