Final answer:
The weight % of sulfur in crude oil is less than 1%.
Step-by-step explanation:
The weight % of sulfur in crude oil can vary depending on the source and type of crude oil. On average, the sulfur content in crude oil is around 2-3%. However, it can range from less than 1% to more than 5% in certain cases. Therefore, the correct option from the given choices would be a) Less than 1%.