If the Current Allocation of Resources in the Market for Wallpaper

Multiple Choice

If the current allocation of resources in the market for wallpaper is efficient,then it must be the case that

A) producer surplus equals consumer surplus in the market for wallpaper.
B) the market for wallpaper is in equilibrium.
C) on the last unit of wallpaper that was produced and sold,the value to buyers exceeded the cost to sellers.
D) All of the above are correct.