
Answer:
c) 23
Step-by-step explanation:
The relationship between the amount of growth per 3 weeks is proportional.
If you made a table it would look similar to:
x    |      y  | Rate of Change
1 Â Â Â | Â Â Â Â Â 3 Â | +0
2 Â Â | Â Â Â Â Â 5 Â | +2
4 Â Â | Â Â Â Â Â 8 Â | +3
6 Â Â | Â Â Â Â 12 Â | +4
8 Â Â | Â Â Â Â Â 17 | +5
10 Â Â | Â Â Â Â 23 | +6