A business making bicycles has these costs at different output levels. Output 10: total fixed costs $300$, total variable costs $800$. Output 20: total fixed costs $300$, total variable costs $1500$. Output 30: total fixed costs $300$, total variable costs $3300$. What happens to the average total cost over this range of output?
- AIt falls continuously.
- BIt falls then rises.
- CIt rises continuously.
- DIt rises then falls.