For a batch process with a chemical reaction, the differential material balance during the time period when the reaction is happening is given by the equation (dm/dt = rate of accumulation, mgeneration = rate of generation, mconsumption = rate of consumption, minput = rate of input, moutput = rate of output): Select one: a. dm/dt= minput - mconsumption b. dm/dt= moutput - mgeneration c. dm/dt= minput - moutput d. dm/dt= mgeneration - mconsumption