What combination is the best choice for the preparation of 3-chloro-1-iodobutane? Answer a.) 1-Iodobutane + chlorine (400 °C) b.) 2-Chlorobutane + iodine (400 °C) c.) 1,3-Dichlorobutane + sodium iodide (1 mole) in acetone d.) 1,3-Diiodobutane + sodium chloride (1 mole) in acetone e.) 3-Bromo-1-iodobutane + sodium chloride (1 mole) in acetone