Final answer:
The correct answer to the question is 'modest,' as it is the antonym of conceited. The sentence highlights the actor's lack of modesty in discussing his numerous achievements.
Step-by-step explanation:
The sentence provided implies that the actor in question is discussing his triumphs and achievements without any modesty or humility. Thus, we are looking for a word that is the opposite of 'conceited' since the sentence suggests a contrast with the word 'anything but.' The correct answer would be modest, as it is the antonym of conceited and arrogant. Being modest would mean downplaying one's own accomplishments, which the actor did not do. Option b) 'humble' is synonymously close to modest and therefore could be a correct answer in a different context, but given the structure of the sentence, 'modest' fits best. Choices c) 'arrogant' and d) 'reserved' are not the opposites of conceited, and in the case of 'arrogant,' it is practically a synonym.