This is one of factors of production (productive resource), referring to anything that is taken from the earth during the production of a good or service.

Land is one of factors of production (productive resource), referring to anything that is taken from the earth during the production of a good or service.

Land is a naturally reoccurring resource that someone can use when producing a good or service. Farmers use land to create their products they sell, they need to be able to plant and grow crops to make a living. Locations of the land, what is found naturally on the land and weather conditions all have a huge factor in production with natural resources. 

It's most likely choice a, it makes the most sense in my opinion.