In a Study Comparing Chinese, American, and Israeli Managers, the Greatest

In a study comparing Chinese, American, and Israeli managers, the greatest amount of work was done by

A) Israeli and American managers working alone and Chinese managers working in groups.
B) Israeli, Chinese, and American managers when they each worked in groups.
C) American managers working alone, Israeli managers working with outgroup members, and Chinese managers working with ingroup members.
D) American managers working alone, Israeli managers working with ingroup members, and Chinese managers working with any group.
E) American managers working alone and Chinese and Israeli managers each working with ingroup members.