The correct option is A Price of a good and the quantity demanded
1:The Law of Demand, assuming other things to remain constant, establishes
the relationship between price of a good and the quantity demanded.
2:Law of demand states that, "conditional on all else being equal, as the price of a good increases (↑), quantity demanded decreases (↓); conversely, as the price of a good decreases (↓), quantity demanded increases (↑)".