Compared with Nitrogen, Do We Need to Be Concerned That

Compared with nitrogen, do we need to be concerned that we may run out of phosphates?

A) Yes. Nitrogen is obtained from nitrogen gas, which is in virtually infinite supply. Phosphate is mined from sedimentary rock and deposits are limited.
B) Yes. Nitrogen is obtained from ammonia, which is in virtually infinite supply. Phosphate is mined from sedimentary rock and deposits are limited.
C) No. Although phosphate is mined from sedimentary rock, deposits are extensive enough that we can consider them virtually unlimited, just like nitrogen gas.
D) No. Although phosphate is mined from sedimentary rock, deposits are virtually unlimited, just like the ammonia from which we derive our nitrogen.
E) No. Both phosphate and nitrogen are readily available as gas from the atmosphere.