In the diary of anne frank, the conflict between peter and mr. dussel about mr. dussel’s unkind words to peter’s mother supports the theme that wartime often brings out the worst in people. children always tend to defend their parents. difficult times tend to tear friendships apart. people are not always as they appear to be.

i personally believe that the answer is :

d) people are not always as they appear to be

at first,   mr dussel was kind and often opted for gentle words however after a while of often spending time with peter's family he finally showed his true side and rudely referred to peter's mom.

hope this !

answer: the prince warns the 2 families that if they get into another fight they will be put to death