A company that manufactures hiking boots produces 100 pairs of boots each day. The total daily production costs are $9,400, which include the cost of producing the boots plus $400 of fixed costs per day. Which of the following equations represents the daily production cost based on the number of pairs of boots manufactured?

(Let C(x) represent the daily production cost and x represent the number of pairs of boots manufactured.)
A. C(x) = 90x + 400
B. C(x) = 94x
C. C(x) = 100x + 400
D. C(x) = 90x - 400