This question is about the correct preposition to use with the adjective 'indifferent'. The correct answer is A. 'indifferent to' is the correct collocation, expressing a lack of concern or interest in something. Option B, 'indifferent for', is not a standard collocation. Option C, 'indifferent with', is grammatically incorrect in this context. Option D, 'indifferent from', does not convey the intended meaning of 'not caring about something'. The essential concept here is the correct collocation with the adjective 'indifferent'.