Arthur Sells $100 Worth of Cotton to Bob

Arthur sells $100 worth of cotton to Bob.Bob turns the cotton into cloth, which he sells to Camille for $300.Camille uses the cloth to make prom dresses that she sells to Donita for $700.Donita sells the dresses for $1,200 to kids attending the prom.The total contribution to GDP of this series of transactions is

A) $1,200.
B) $500.
C) $2,300.
D) $1,100.