identify the choice which features a relative clause.
a) it was a cold, crisp november day when i purchased my first automobile.
b) although i purchased an automobile, i still didn't really feel grown up.
c) while i enjoyed purchasing an automobile, i would also have liked to have bought a house.
d) i purchased my first automobile on a cold, crisp november day.

A) It was a cold, crisp November day when I purchased my first automobile.

Explanation:

A relative clause starts with a relative pronoun

who/that

which/that

where

when

whose

There doesn't have to be a comma in between the relative pronoun and the rest of the sentence to make it a relative clause

no it who u choose to be. let no one tel u what or who to be;

hm, switch the relative; nominative and indefinite; objective ? not too bright in the knowledge of the english.