The causes for renal failure mentioned in the passage are __________.
Option C is the correct answer because the passage describes over-consumption of packaged and processed foods that have chemical additives leads to renal failure and adverse effects on kidneys. Thus, option C is the right answer.
Option A is incorrect because the passage mentions that traditional methods of cooking food at home will help one remain fit and lead an active life. Thus, option A is not the right answer.
Option B is incorrect because the passage describes that the sweeteners used in the packaged food products are saccharin and not sugar. Long term consumption of these will affect the metabolism. So option B is not the right answer.
Option D is incorrect because the passage describes that it is the over consumption of packaged and processed foods that leads to renal failure and not merely the availability. So option D is not the right answer.