Correct Answer - Option 2 : 7

^{th}
Given,

A's position from left = 13

A's position from right = 11.

**Total number of boys in the row = Position of A from left + position of A from right - 1**

= 13 + 11 - 1

= 23

So, there are 23 boys in the row.

Given, position of D from right = 17.

Let position of D from left be x

**Total number of boys in the row = Position of D from left + position of D from right - 1**

23 = x + 17 - 1

x = 23 - 17 + 1

= 7.

So, D is seventh from the left.

Hence, the correct answer is **"7**^{th}".