Chapter 2 - Set Theory - 2.4 Set Operations and Venn Diagrams with Three Sets - Exercise Set 2.4 - Page 94: 104

$I$

"Wind of Change" was recorded by The Scorpions, a group. It sold 14 million copies and was released in 1991. Thus, this song belongs to the set "Recorded by a group" but not to "Recorded before 1990" and "Sales exceeded 15 million." Therefore, it must be written in Region $I$.