If those are the optional answers, it's most likely sodium.
The answer is B.
These elements are among the most important elements in life. Most of these elements are also non-metals. Elements life sulfur and nitrogen combine with carbohydrates to form among acids rings like cysteine. Carbohydrates combine with phosphorus to form molecules such as the DNA backbone chain.
B) Oxygen may not have been able to accumulate in the atmosphere
i would say the best answer is d