The correct option is D a; no article
If two nouns refer to the same person or thing, the article is used before the first noun only. But if the nouns refer to different persons or things, the article is used before each noun. SInce in the given statement, both the nouns yellow and blue refer to one bird the article will be used before the first noun only and no article will be used before the second. Also, the indefinite article 'a' should be used whenever noun is unspecific. Therefore, Option C is the correct answer. Since the nouns are not used to refer the two different birds, the indefinite article 'a' cannot be used before the second noun. Therefore, Option A is incorrect. 'The' cannot be used in when the nouns are being used in general, it is used with specified nouns only. Therefore, Option B and D are incorrect.