Answer:
A. Holiday lights in mid-December: Scarce on occasion: Holiday lights are only scarce on holiday season when the demand increases.
B. Air regardless of quality: Not scarce : Only high quality air (clean) is scare.
C. Land: Inherently scarce: No matter what we do, our planet is only one.
D. Patented goods: Artificially scarce: Patents are scarce because a law protects them.
E. Original Picasso paintings: Inherently scarce: Picasso is dead, so he cannot paint anymore.