A chemist is studying an Enzyme, E, and its effect on a particular substrate, S. E and S react in a one-to-one ratio and the differential equation describing the rate of change of the concentration of E is d [E] dt = -0.6[E][S]. When t = 0, [E]o = 3 and [S]= 4. Use Euler's method with At = 0.3 to approximate the concentration of E when t = 0.6. * © a) 1.56 ○ b) -6.42 c) -2.2 d) 0.562