It took Time Out Video years to develop its new video game, establish channels through which to distribute this game, and design and implement its advertising campaign for the game. However, the game's price can be set or changed in a few minutes. This reflects the fact that

A.the quantity demanded goes up as the price goes up.

B.The longer the other marketing mix variables take, the higher the price of the product must be set.

C.pricing is the least important variable in the marketing mix.

D.price is the most flexible variable in the marketing mix.