Apple Launched Its IPhone in 2007 and Has Become the World's

Apple launched its iPhone in 2007 and has become the world's best smartphone with its multitouch user interface and its "apps." The product class has experienced tremendous growth,both in terms of sales and the addition of formidable competitors such as Samsung,LG,HTC,Nokia,BlackBerry,etc.vying for market share.Which stage of the product life cycle are smartphones such as the iPhone in?

A) decline stage
B) commercialization stage
C) maturity stage
D) growth stage
E) introduction stage