The drug concentration in the bloodstream t hours after injection is given approximately by C(t) = 4.35e", 0sts 5, where C(t) is the concentration in milligrams per milliliter. (A) What is the rate of change of concentration after 3 hours? After 5 hours? (B) Graph C. . . . (A) Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round until the final answer. Then round to the nearest hundredth as needed.) O A. After 3 hours, the concentration is increasing at the rate of mg/mL per hour. O B. After 3 hours, the concentration is decreasing at the rate of mg/mL per hour. O C. After 3 hours, the rate is neither increasing nor decreasing.A research group using hospital records developed an approximate mathematical model relating systolic blood pressure and age. P(x) = 60+ 35 In (x+3) OSxs65 P(x) is pressure measured in millimeters of mercury and x is age in years. . . . The rate of change of pressure at the end of 20 years is mm/year. (Type an integer or decimal rounded to the nearest hundredth as needed.)