Loop variables scope limited to that enclosing loop. So in this case, the scope of the loop variable x declared at line 5, limited to that for loop. Trying to access that variable at line 7, which is out of scope of the variable x, causes a compile time error. So compilation fails due to error at line 7.
Hence option D is correct. Options A and B are incorrect, since code fails to compile. Reference:
httpsy/docs.oracle.com/javase/tutorial/java/nutsandbolts/variables.html