The correct option is
B Noun
Option B: A noun names a person, place or a thing. In the given sentence, 'street'
names a piece of land adjoining buildings in an urban context. Hence
this word is a noun and option B is correct.
Options A, C and D:
A: A preposition is a word that connects a noun or pronoun to the rest of the sentence. These include 'in, on, under, over, to, from, etc.' 'Street' does not function as a preposition by this definition.
C: A pronoun is a word referring to a noun that's been mentioned before. They include 'it, him, she, etc.' 'Street' does not function as a pronoun by this definition.
D: A conjunction is a word that connects or joins two or more clauses or phrases. They include 'and, but, unless, etc.' 'Street' does not function as a conjunction by this definition.
Hence these options are incorrect.