Other things constant, if the price of timber increases, we would expect to see:

A$)$ an increase in the equilibrium price and quantity of new housing.

B$)$ a decrease in the equilibrium price and quantity of new housing.

C$)$ an increase in the price of new housing and a decrease in the number of new homes built.

D$)$ a decrease in the price of new housing and an increase in the number of new homes built.