econ problem: supply and demand

Q: you have been asked by your economics professor to graph the market for
lumber and then to analyse the change that would occur in equilibrium price
as a result of recent forest fires in the west. your first step would be to .....

a, decide which direction to shift the curve
b, decide whether the fires affected demand or supply.
c, graph the shift to see the affect on equilibrium
d, none of the above is correct