The only common noun in this sentence is the word “citizens”. Common nouns are the names provided to things (lamp, telephone), places (park, grocery store), and animals (cat, dog). Common nouns are general terms to name different things.
Names of countries as well as nationalities are proper nouns, so Canada and French are not common nouns in the sentence provided.
The second answer is the proper answer. You can find this by looking into the text where it says "The average range is 40 miles depending on topography.