Concentration data were collected at 15 time points for the polymerization reaction:We ass...

Concentration data were collected at 15 time points for the polymerization reaction:

We assume the reaction occurs via a complex mechanism consisting of many steps. Several models have been hypothesized, and the sum of the squares of the residuals had been calculated for the fits of the models of the data. The results are shown below. which  model best describes the data (statistically)?Explain your choice.