Suppose That the Garden Gnome Industry Was in Long-Run Equilibrium

Suppose that the garden gnome industry was in long-run equilibrium given the circumstances described Suppose, that it was discovered to everyone's surprise on January 1, 1993, after it was too late to change orders for gnome molds, that the cost of the plaster and labor needed to make a gnome had changed to $6.If the demand curve does not change, what will happen to the equilibrium price of gnomes?

A) Falls by $1.
B) Rises by $6.
C) Stays constant.
D) Rises by $1.
E) Falls by $3.