Which of the following regions is part of the northern Rhone?

Côte Rôtie is indeed part of the northern Rhône region. This area is renowned for its steep, terraced vineyards and is primarily known for its high-quality red wines made from Syrah grapes, often blended with a small percentage of Viognier. The climate in this region helps to produce wines with intense aromatics and complex flavors, characteristic of northern Rhône Syrahs.

In contrast, Châteauneuf-du-Pape, although famous for its red wines, is located in the southern Rhône. Similarly, Côtes du Rhône Villages encompasses both northern and southern Rhône areas, but the specific villages that qualify depend on their location. Tavel is also in the southern Rhône and is best known for its rosé wines. Therefore, Côte Rôtie's definitive presence in the northern Rhône solidifies it as the correct choice.