Option C is the correct answer
So let's help Mr. Dawson to demonstrate why.
The functions model the cost of the plot of land after x years, so we need to find the cheaper option. Therefore:
Cost of the option A:
Cost of the option B:
![g(30)=700*30+8000=\$29000](https://img.qammunity.org/2019/formulas/mathematics/high-school/jmcz481h1oysp52uby14ajf7po7uf7szep.png)
Cost of the option C: This is the cheaper option
![h(30)=30^(2)+400*30+8000=\$20900](https://img.qammunity.org/2019/formulas/mathematics/high-school/3qxqgkjylvojx4kh9oqd7jbpn54jd7fw5f.png)