The mother supports the theme that wartime always brings out the worst in people. Hope this helps! :)
Adjective clauses provide information about some noun in the sentence, which is the same function as adjectives.
So an adjective would be "to tell the interesting story", where interesting gives some information about the story.
Similarly, "which is about wild ponies" is the whole adjective phrase - and this is the correct answer- gives some information about the story.
Mr.Charrington was the one who caught them?
