Which of the following is a renewable resource?

a. Land

b. Minerals

c. Fossil fuels

d. Wind

Minerals and fossil fuels are not renewable (well, they are, but not in a human timescale, but in a timescale of thousands if not millions of years). - b. and c. are wrong

d. is definitely a renewable resource: no matter how much we use, we can still use more. (this would be the correct answer)

about a.) : I am not too sure how to understand this. If by land the question means soil, then soil can be spent, but also it can recover - depending on how badly "spent" it was before.