Choose the appropriate pair of words that matches the relationship between Obstinate: Stubborn

The question is asking you to pick the pair of words that has a similar relationship to the words "Obstinate" and "Stubborn". The words "Obstinate" and "Stubborn" mean the same thing, just like the words "Brilliant" and "Talented" have a similar meaning. Therefore, the correct answer is "Brilliant: Talented". The other pairs of words do not have a similar relationship to "Obstinate" and "Stubborn".