The Scatterplot Below Displays World Population (In Millions)for the Years

The scatterplot below displays world population (in millions) for the years 0 - 1800.Where the population is an estimate,the lower estimate is given.For what range of years is a linear model appropriate?

A) One linear model is appropriate for the years 0 through 1000 and another linear model for the years 1400 through 1800.
B) A single linear model is appropriate for the entire data set.
C) One linear model is appropriate for the years 0 through 600 and another linear model for the years 600 through 1800.
D) A linear model should be used for each pair of adjacent data points.
E) A linear model should not be used for any part of the data.