1I alone is sufficient while II alone is not sufficient
2II alone is sufficient while I alone is not sufficient
3Either I or II is sufficient
4Neither I nor II is sufficient
From the two statements given in I, the code for the only common word 'beautiful' can be determined.
From the two statements given in II, the code for the only common word 'red' can be determined.
In I and II, the common words are 'rose and 'flower' and the common code words are 'de' and 'la'. So, the code for 'flower' is either 'de' or 'la'.