About how much time did it take for the ancestors of modern giraffes to evolve the long necks of modern giraffes? a.a year b.many decades c.hundreds of years d.millions of years

It depends on what you believe. Many Evolutionists would say D. But if you believe in the Bible, then the answer is C.

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.