What is the function of the relative pronoun in the adjective clause?
albert einstein, whose theories changed science forever, is a great inspiration to me.
a. possessive
b. subject
c. object of a preposition
d. direct object

The function of the relative pronoun in the adjective clause is A. POSSESSIVE.

In the above sentence:
the adjective clause is whose theories changed science forever.
the relative pronoun in the adjective clause is whose

The relative pronoun whose is a possessive for of who, another relative pronoun.

There are 5 common relative pronouns used in adjective clauses.
These are who, which, that, whose, and whom.

who - refers to people
which - refers to things
that - refers to people or thing
whose - possessive form of who; describes something that belongs to or is part of someone or something mentioned in the main clause.
whom - object form of who; stands for the noun that receives the action of the verb in the adjective clause.

It shows he knows real life experiences and how people live on these harsh conditions

"as the band marched across the crowd field cheered"