I thought ‘ini’ meant it was ‘these balls’ not ‘the balls’ (which I thought was ‘itu’) can someone explain?
there is no direct translation for article (a, an, the) in Indonesian, so usually we just use "ini / itu / nya" to translate the article depending on the context.
But for this question, i think "these balls" should be the correct one
"These balls are red and white." = also accepted as a correct answer.