taxi, Empire State Building, corner, Fifth Avenue, at(?) West 54th Street.
Explanation:
Well a noun is a person place or thing. Street numbers are nouns as well. A is an indefinite article. I am not a 100% sure this is correct but from my perspective thats what it is. At is either a preposition or a noun. In this situation, I believe it is a noun.
The correct answer is D. An enjoyment of solitude. Both loved living in the outdoors and being alone with their thoughts in the woods. This can be seen in the work "Walden" by Thoreau.