Yard Whimzees,a Statesboro,Georgia Sign Business,began by Making Wooden Signs for Residential

Yard Whimzees,a Statesboro,Georgia sign business,began by making wooden signs for residential use to announce births,anniversaries,and such.The company then turned to the business market by making signs for businesses.Creating signs for a new market is an implementation of a _____ strategy.

A) market development
B) market penetration
C) product penetration
D) product development
E) diversification