The correct answer is 'b) feed' because 'at the moment' indicates an ongoing action, but the sentence structure implies a completed action that is preventing speech. However, given the options and common phrasing, 'feed' is the most logical choice for a present continuous action that might be interrupted. Re-evaluating, 'I am feeding' would be the present continuous. The sentence implies an action that is happening now. Therefore, 'b) feed' is incorrect. 'c) fed' is past tense. 'a) am feeding' is the correct present continuous form.