Downward-Sloping Demand Curve Reflects Law of Demand

Steps:

• Examine the demand curve: it slopes downward, showing price and quantity demanded move inversely.
• Apply law of demand: higher price leads to lower quantity demanded, and lower price to higher quantity.
• Match to options: A describes quantity varying with price changes, aligning with the curve's nature.
• Eliminate mismatches: B, C, and D fail to capture the inverse relationship accurately.

Why A is correct:

• The law of demand states that quantity demanded changes inversely with price, so greater or smaller quantities result from price variations.

Why the others are wrong:

• B: Illogical; price causes quantity changes, not vice versa, and "fall" is vague.
• C: Incorrect; as price increases, quantity demanded falls, not "so does fall."
• D: False; quantity changes are not always proportional to price (depends on elasticity).

Final answer: A