[单选题]Click the Exhibit button.   What is the result？（）

A  The code will deadlock.

B  The code may run with output "2 0 6 4".

C  The code may run with no output.

D  The code may run with output "0 6".

E  An exception is thrown at runtime.

F  The code may run with output "0 2 4 6".