Consider the following 5 plots of concentration ?? versus position ?? across a barrier (indicated by the orange highlighting). All 5 plots are on the same scale. Assuming that the barriers all have the same area ?? and same diffusion coefficient ??, rank the (magnitude of the) rate at which molecules cross the barriers, from largest to smallest.

Consider the following 5 plots of concentration ?? versus position ?? across a barrier (indicated by the orange highlighting). All 5 plots are on the same scale. Assuming that the barriers all have the same area ?? and same diffusion coefficient ??, rank the (magnitude of the) rate at which molecules cross the barriers, from largest to smallest.