The missing section is `C`

**Method 1**

Moving from left to right row wise add 3 to previous digit. i.e. 7, 7+3 =10, 10+3 = 13, 13+3 = 16

So on we get 15 in second row and 14 & 17 in 3rd Row.

**Method 2**

Moving downside column wise add 2 to previous digit. i.e. 7, 7+2 =9, 9+2 = 11, 11+2 = 13

So on we get 14 in second Column and 15 & 17 in 3rd Column.