School wants youngster to know which races are worth effort

The CBC, is reporting on the complaint by the mother of an adopted Ethiopian child who had to console her child when she came home with this Grade 4 homework assignment:

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Roughly, the children are given the situation that the planet is about to explode, and the spaceship can only hold 3 people. However, there are four people present, a francophone, a Chinese person , an African and an Englishman.  You have 10 minutes to decide who gets on the rocket ship and who dies.  
The title of the assignment is “The respect of ethnic groups: A roleplay game”
In defense of this the principal said “..some of the students would say ‘Well, we’ve chosen to keep the three main ethnical groups in our community, which is English, French and Amerindian, because of being able to communicate.’ “ 
  Wow…just… wow.  That is certainly a rational response, but the question is so horrific that suddenly we are defining worth based on race and linguistic character? The problem would have been interesting when I was in grade 4, given that my ethnicity wasn’t even represented.
Thoughts?