American automobile manufacturers and dealers appear to adjust the price (sticker prices plus financing charges) by periodically changing interest rates and by using rebates and surcharges as opposed to directly changing sticker prices

Assuming that they maximize their profits, this pricing approach may reflect A) a relatively low cost to adjust sticker prices.
B) a relatively low cost to adjust advertising.
C) a relatively high cost to adjust sticker prices.
D) a relatively high cost of advertising.

C