Find the correct statement/statements.

(A) Goods which are consumed together are called complementary goods.

(B) The market demand curve can be derived as a vertical summation of the individual demand curves.

(C) Price elasticity of demand is a measure of the responsiveness of the demand for a good to changes in its price.

(D) If the consumer's preferences change in favor of a good, the demand curve for such a good shifts leftward.

Choose the correct answer from the options given below:

Statement (A) -> Complementary goods are indeed goods consumed together (e.g., tea and sugar, car and petrol) -> Correct.

Statement (B) -> Market demand curve is derived by HORIZONTAL summation (adding quantities at each price), not vertical summation -> Incorrect.

Statement (C) -> Price elasticity of demand measures the percentage change in quantity demanded relative to percentage change in price -> Correct.

Statement (D) -> When preferences change in favor of a good, demand curve shifts RIGHTWARD (increase in demand), not leftward -> Incorrect.

Hence, Option 1: (A) and (C) only -> Statement A correctly defines complementary goods as goods consumed together. Statement C accurately describes price elasticity of demand as a measure of responsiveness of quantity demanded to price changes. Statement B is wrong because market demand uses horizontal summation (adding quantities), and Statement D is wrong because favorable preference changes shift demand rightward, not leftward -> correct