For the following stirred tank reaction, carry out the following analysis. a. Write an initial value problem for the mass of the substance. b. Solve the initial value problem. A 500-L tank is initially filled with pure water. A copper sulfate solution with a concentration of 25 g/L flows into the tank at a rate of 2 L/min. The thoroughly mixed solution is drained from the tank at a rate of 2 L/ min. a. Write an initial value problem for the mass of the substance. Choose the correct answer below. O A. m'(t) = - 0.004m(t) - 50, m(0) = 0 O B. m'(t) = 0.004m(t) - 50, m(0) =0 O c. m'(t) = 0.08m(t) + 25, m(0) =25 O D. m'(t) = 0.004m(t) + 50, m(0) = 0 OE. m'(t) = - 0.004m(t) + 50, m(0) = 0 OF. m'(t) = - 0.08m(t) + 25, m(0) = 25 G. m'(t) = - 0.08m(t) - 25, m(0) = 25 OH. m'(t) = 0.08m(t) - 25, m(0) = 25 b. Solve the initial value problem. m(t) =