Final answer:
The weight % of Nitrogen in crude oil is generally less than 1%.
Step-by-step explanation:
The weight % of Nitrogen in crude oil is generally less than 1%. Crude oil is primarily composed of hydrocarbons, which are compounds made up of carbon and hydrogen. While trace amounts of nitrogen can be found in crude oil, its concentration is usually very low. Therefore, the correct answer is a) Less than 1%.