1. determine whether each coefficient is positive or negative
2. choose the coefficient closest to 0
3. choose the coefficient with the greatest value

1) First and last coefficients are negative because graph is on negative side of y axis. Second and third are positive because graph is on positive side of y axis.

2) Coeff. closest to 0 is C because as x increases c*x^2 = y increases at lowest rate (you can say that the wider graph the lower coefficient is)

3) Oposite from 2. Coeff with greatest value is A

The correct answer would be "convenience"