Singers, Boys and Dancers.

On the basis of above given question , we can say that
Some singers may be boys and vice-versa.
Some boys may be dancers and vice-versa.
Some singers may be dancers and vice-versa.
Some singers who are boys may be dancers.
From above it is clear that option ( C ) represents the best relationship between Singers, Boys and Dancers. As shown in given venn - diagram .