The following function represents the production cost f(x), in dollars, for x number of units produced by company 1:

f(x) = 0.15x2 − 6x + 400

The following table represents the production cost g(x), in dollars, for x number of units produced by company 2:

x g(x)
50 75
60 60
70 55
80 60
90 75

Based on the given information, determine which company has a lower minimum and find the minimum value.
A. g(x) at (70, 55)
B. f(x) at (20, 340)
C. f(x) at (70, 55)
D. g(x) at (20, 340)