PLEASE HELP! The table (look down for table) at the right shows the amount of carbon dioxide in the atmosphere for selected years. Make a scatter plot of the data, letting x be the number of years after 1900. Determine the kind of polynomial model that seems to be most appropriate. Predict the amount of carbon dioxide in the atmosphere in 1998. Are you confident in the prediction?

1. The correct graph is shown below. Each of the graphs is shown in a [0,120,10] by [300,400,10] viewing window. What kind of model seems to be most appropriate?

-Quadratic
-Linear
-Cubic

2. Predict the amount of carbon dioxide in the atmosphere in 1998

ppm

3. Are you confident in the prediction?

-Yes, since the the prediction was interpolated.
-Yes, since the prediction was extrapolated.
-No, since the prediction was interpolated.
-No, since the equation was extrapolated.

I couldn't enter the table but it's this:
year: 1968, 1983, 1998, 1003, 1008
ppm: 325.48, 342.26, 368.79, 375.59, 386.55