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Solutions
As per the given information,
In a row of 21 students, when Murali was shifted by four places towards the right, he became 12th from the left end.

Now,
The new position of Murali from the left is 12th thus before shifting by four places towards the right the position of Murali was 8th from the left.
So, the earlier position of Murali = 8th
Now,
Total students = Earlier position of Murali from left + Earlier position of Murali from right - 1
⇒ 21 = 8 + Earlier position of Murali from right - 1
⇒ 21 = 7 + Earlier position of Murali from right
⇒ Earlier position of Murali from right = 21 - 7
⇒ Earlier position of Murali from right = 14
Thus, Murali's earlier position from the right end of the row is '14th'.
Hence, the correct answer is "14th".