Present Continuous Tense (Şimdiki Zaman) tekrarı Test 1

Aşağıdaki cümlelerden hangisinde Present Continuous Tense yanlış kullanılmıştır?

A) My mother is cooking dinner now.
B) The children is sleeping in their rooms.
C) I am studying for my exam right now.
D) You are listening to music at the moment.