Correct Answer: C
Solution :All the elements together move one space to the right in each step and once they reach the rightmost position, then in the next step, they move to the leftmost position. Also, in the first step, the firs (uppermost) and the third elements interchange positions; in the second step, the second and the fourth elements inter change positions and in the third step, none of the elements interchange positions. These three steps are repeated to continue the series.
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