From statement I: Black is called white, white is called yellow, and yellow is called red. Since sky's color is blue but here, we do not get blue's code. So, the data in statement I alone is not sufficient to answer the question. From statement II: Red is called blue, blue is called orange, and orange is called green. Since sky's color is blue here blue is called orange. So, the color of sky is orange. So, the data in statement II alone are sufficient to answer the question. Hence, the data in statement II alone are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question.