Scientists are examining a substance that has a half-life of 10 years. The table represents the amount, in grams, of the substance after x half-life cycles. X 2 3 4 5 6 g(x) 750 375 187.5 93.75 46.875 What is the average rate of change over the interval [4, 6]? (Round to the nearest hundredth if necessary.) A. -140.62 grams per half-life cycle OB. -70.31 grams per half-life cycle OC. -35.16 grams per half-life cycle OD. 23.44 grams per half-life cycle