Which of the following organic molecules is a source of carbon, nitrogen, and phosphorus?
a) calcium carbonate
b)nucleic acids
c)ammonia

I think the correct answer from the choices listed above is option B. It is nucleic acid the organic molecule that is a source of carbon, nitrogen, and phosphorus. Also, among the choices, it is the only organic molecule. Calcium carbonate and ammonia are inorganic molecules and they do not contain all elements mentioned above.

Ithink the answer is d i hope it ya