A publishing company has published a new magazine for young adults. The monthly sales S (in thousands) is given by 
where t is the number of months since the first issue was published. Find S(3) and S'(3) and interpret the results.
A. At three months, the monthly sales are $480,000 and decreasing at 64,000 magazines per month.
B. At three months, the monthly sales are $2, 400,000 and increasing at 64,000 magazines per month.
C. At three months, the monthly sales are $2,400,000 and increasing at 800,000 magazines per month.
D. At three months, the monthly sales are $480,000 and increasing at 64,000 magazines per month.
Answer: D
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