16. [1 point] Which of the following statement is true: A. The plume mode describes the steady-state concentration of material released from a continuous source B. The puff mode describes the time-based concentration from a single release of a fixed amount of material: C. Eddy diffusivities represents turbulence. D. All answers are correct 9. [1 point] Which of the following is not true: A. As release height increases, ground level concentrations are reduced B. As release height decrease, ground level concentrations are increased C. As release height increases, ground level concentrations are increased D. No relation between release height and ground level concentration