Matter is always recycled in the biosphere and that is why the total amount of matter in the system remains constant. Nutrients move in the biological, geological, and chemical components of the biosphere and they are transformed to the usable form as and when required. There is a constant interaction of environment with the organism with respect to the nutrients and water. Some limiting nutrients can decrease the primary productivity of a land. This is because, either such nutrients are scarce or recycle very slowly in the environment. Therefore, the options (a), (b), (d), and (e) are true about the matter of the biosphere and they are incorrect options. No matter what the process may be involved in the biosphere, total amount of matter always remains constant.
Hence, the correct option is (c) the total amount of matter decreases over the time.