When an aircraft lands at an aerodrome of another contracting state for technical reasons, which freedom of air is applicable?

The second freedom of air pertains specifically to the right of an aircraft to land at a foreign airport for technical reasons—this includes reasons such as refueling, repairs, or emergency situations. This freedom allows aircraft to make necessary stops without engaging in commercial activities within that foreign state, facilitating safe operations while in international airspace.

In this context, since the question relates to technical landings, the correct answer highlights that these operations are recognized under the second freedom. Other freedoms of air relate to different aspects of international aviation, such as the rights to transport passengers or cargo between states or beyond, and thus would not apply in this situation where the focus is solely on technical landings.