Assignment 9 Q

Salamun alaykum, I believe there is a mistake with question 1 in assignment 9. its as stated: 1-• When one becomes thirsty even if there is no fear of death 1- • The Sobh (morning) salah; two rak‘ah. 2- • The Duhr (noon) salah; three rak‘ah, 3- • The ‘Asr (afternoon) salah; four rak‘ah, 4- • The Maghrib (after sunset) salah; three rak‘ah, From the answers available I deduced that the question is "Which one is incorrect?" Or amongst that line. As a experiment when I select answer 2 and it was correct. Unless I'm missing the point of the question I can't put this one together. Thank you , Salaamun alaykum