Answer:
C. Mis primos llevaron mal durante la fiesta.
Step-by-step explanation:
My cousins were getting along badly during the party"? In Spanish you would say Mis primos llevaron mal durante la fiesta. When you translate that in English, you would say
My cousins were bad at the party
A. Mis primos se llevaban mal durante la fiesta.
English : My cousins got on badly at the party.
B. Mis primos se llevan mal durante la fiesta.
English: My cousins get on badly at the party.
.D. Mis primos se llevó mal durante la fiesta;
English: My cousins got on badly at the party