Answer the question referring to the letter sequence given below:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
If every alternative letter starting from O is replaced with odd numbers starting from. 1, which letter or number will be third to the left of tenth letter from your right?
1) 15
2) L
3) S
4) Z
5) None of these

Explanation

4