Answer :

3h+5

For example- 
0x3=0+5=5
1x3=3+5=8
2X3=6+5=11
3x3=9+5=14
4x3-12+5=17
It's D.
C0: 0 * 3 = 0. 0 + 5 = 5
C1: 1 * 3 = 3. 3 + 5 = 8
C2: 2 * 3 = 6. 6 + 5 = 11
C3: 3 * 3 = 9. 9 + 5 = 14
C4: 4 * 3 = 12. 12 + 5 = 17

I'd be glad to help if you have any more questions! :D

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