A curve extends linearly from (-5, 0) through (-4, 0), (-3, 0), and (-2, 0) then rises through (0, 1), (1, 4), and (1.3, 6) on the xy-coordinate plane. Which of the following is equal to g(x)?
a. g(x) = x² + 1
b. g(x) = 2x² + 1
c. g(x) = x³ + 1
d. g(x) = 3x² + 1