What was the main reason that the belgian colonial government in rwanda established a national identity card that included the category "ethnicity"? ?

It is believed that the main reason behind the Belgian colonial government's decision in Rwanda was meant exclusively to enforce segregation between Hutus and Tutsis.  The Belgian considered the Tutsi as the superior race and discriminated against the Hutu people.

it wanted to boycott trade with enemy nations.

the answer is option a.