Why is citric acid added to food? to add color to add tartness to add bitterness to add sweetness its b. i'm only putting this out there because all the ones that are already on this website are wrong and archived.

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium