Option A - 'The better actor' is incorrect as the sentence describes the person in general and it is not a definite fact. 'A producer' is correct as the noun is singular. Thus option A is incorrect.
Option B - 'A better actor' is correct as the sentence describes the person in general and is a singular noun. 'An producer' is incorrect as 'producer' has a consonant sound. Thus option B is incorrect.
Option D - 'The better actor' is incorrect as the sentence describes the person in general and it is not a definite fact. We will put 'a' before 'producer' because it is a general fact and is a singular noun. Thus option D is incorrect.
Option C - 'A better actor' is correct as the sentence describes the person in general and is a singular noun.We will put 'a' before 'producer' because it is a general fact and is a singular noun. Thus option C is the correct answer.
'According to me, he is a better actor than a producer.'