Apple Introduced the IPhone and IPad with Multitouch Screens, as Well

Apple introduced the iPhone and iPad with multitouch screens, as well as the Magic Trackpad, also a multitouch device. These devices require consumers to use gestures (touch, swipe, tap, etc.) to perform various functions. This could make the mouse, a device Apple invented in 1977 for its Apple II, obsolete. With the emergence of multitouch technologies, the mouse most likely is now in the ________ stage of its product life cycle.

A) introduction
B) decline
C) maturity
D) deletion
E) harvesting