Answer:
d) all of the above.
Explanation:
All of the above statement correspond to different definitions of demand that economists use on a daily base.
Statement A) refers to aggregate demand, which is roughly equivalent to GDP.
Statement A.2) refers to demand schedule, which is also simply referred to as demand in the press, or in informal contexts.
Statement B) refers to an equilibrium quantity demanded, which occurs when supply and demand meet under an equilibrium price.
Statement C) refers to quantity demanded because it is not always relevant, when talking about demand, whether the good demanded is a necessity or a luxury.
