
M. Hamel told them that French was the most beautiful language in the world. It was the clearest and the most logical language. ... When a people were enslaved, as long as they held fast to their language, they had the key to their prison.

D - Distinctive
Distictive is a characteristic that sets one apart from something else and is typically used in a positive way.
The other options have negative thoughts and feelings associated with them - you do not want to be lonely, in a deserted location, or one that is eerie.
Camaraderie: comradeship; good-fellowship.
Retrieval I guess it makes sense to me