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.They then turned to the business market 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