- Out ports are ports that serve as terminals for inland transportation but are not directly connected to sea routes, such as Duisburg, which is not a correct match for this category.
- Ports of call, like Piraeus, are ports where ships stop during their journey but are not necessarily hubs for oil shipping or naval activities.
- Oil ports like Tripoli, located in Libya, are specifically designed for the export of oil and related products, which makes this the correct match for "Oil Ports." - Naval ports, such as Kolkata, are military ports with strategic naval importance, but they are not directly related to the oil export industry.
Thus, the correct answer is (C), where Tripoli is the example of an Oil Port.