参考答案：B

解析：

Land is considered a renewable resource because using it in the present does not prevent its use in the future. The known stock of a non-renewable resource is fixed in the short term, but can increase in the long term as technology makes more of the resource accessible. The price of a non-renewable resource is the present value of its expected next-period price. The supply curve for a non-renewable resource is perfectly elastic at that price, and the quantity supplied is determined by demand.