An organism has been discovered that appears to forego metabolizing phosphorous to instead metabolize arsenic.Phosphorous is essential to all living things.Why might this organism have evolved a way to metabolize arsenic in place of phosphorous?

A) Because they differentiated and randomly mutated a way to exploit a resource all other organisms were not consuming.
B) The organism experienced a bottleneck event.
C) The organism evolved in a harsh environment that selected for this biochemical mechanism.
D) It is a morphological trait that protects it from predators since many organisms will die if they eat arsenic.