Option 1 -> committed - means dedicated or devoted to a cause, but doesn't capture the inflexible, unyielding nature of obdurate.
Option 2 -> stubborn - means refusing to change one's opinion or behavior despite persuasion; perfectly captures the inflexible, unyielding quality of obdurate.
Option 3 -> obedient - means willing to comply with orders; this is actually opposite to obdurate.
Option 4 -> subservient - means submissive and willing to obey; also opposite to the meaning of obdurate.
Hence, Option 2: stubborn -> "Obdurate" describes someone who is stubbornly persistent in wrongdoing or hardened against moral influence, making "stubborn" the closest synonym as both convey an unwillingness to change one's mind or position -> correct