Mein Bruder kauft ... Computer. A. das B. die C. der D. dem E. den

E

This question is about German grammar. Specifically, it deals with the correct accusative masculine case of the definite article for "Computer" which is a neuter noun in German. In German, every noun has a grammatical gender (masculine, feminine, or neuter) and the article changes its form depending on the case. Since "kaufen" is an action performed by "mein Bruder" and the direct object that receives this action is the "Computer", we should choose the definite article that aligns with the accusative masculine case . Therefore, the correct definite article in this sentence, in the accusative form, is "den", because "Bruder" is a masculine noun in the German language.