Assume l, is a constant. Choose the DE that is a mathematical model of the following situation: In a coastal town having a fixed population of persons, the time rate of change of the number M of those person who have heard a certain rumor is proportional to those who have not yet heard the rumor. OA dM/dt = kQ – M O B. None of these Oc dM/dt = k(Q – M) D. dM/dt = k(Q – M)!/2

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