Julian asked Chandu why his people's conflict with the ethnic majority has continued so long.

Chandu thought for a moment before replying, "It's partially because, for a long time, we didn't have the knowledge or the power to represent ourselves effectively and stand up for our rights. Over time, our efforts to win justice for ourselves became weaker and weaker as we lost hope and became discouraged.

"But in the last 30 years, many of our young people have traveled abroad and gotten academic degrees, made lots of money, and established contact with people who can help us. When they return to our country, they bring those things back with them. It gives us more resources, more knowledge, and more influence in our struggle.They have made us much more powerful and effective."

Chandu's statement that change began whenyoung people started traveling abroad indicates that his group is an example of a(n)__________.

• system output
• closed system
• open system
• sub-system