I gave my book to the library attendant......... I think works in the evening wich of theses is correct:whom, whose, which and who

The sentence should be: "I gave my book to the library attendant who I think works in the evening."

Here's why:

• Who is used as a subject pronoun, referring to the library attendant who performs the action of "works."
• Whom is an object pronoun and would be incorrect here.
• Whose is a possessive pronoun.
• Which is typically used for things or animals, not people.