[![**The Question is as follows:**][1]][1]


**My Answer is as follows:**
[![enter image description here][2]][2]


**However, the correct answer is as shown below:**
[![enter image description here][3]][3]


  [1]: https://i.sstatic.net/gbIVr.png
  [2]: https://i.sstatic.net/5IOeY.jpg
  [3]: https://i.sstatic.net/gICQQ.png


**My question is where is my mistake?**