Final answer:
In geography, specific names of avenues, highways, and routes are capitalized when part of the official name, so the correct answer to the question is 'All of the above'.
Step-by-step explanation:
In geographic references, proper nouns should be capitalized. This includes specific names of avenues, highways, and routes when they are part of an official name. For example, 'Fifth Avenue', 'Highway 101', and 'Route 66' should all be capitalized because they are the specific names of these geographic features. Therefore, the correct answer is d) All of the above.