Correct Answer: (d) Increase in price of tea
Solution:An increase in the demand for coffee will result in an increase in the price of tea, as coffee and tea are substitutes for each other. With respect to substitute goods, when the price of the commodity increases (decreases), the demand for other goods also increases (decreases), that is, there is a positive relationship between price and demand in relation to substitute goods. Conversely, if the price of a commodity increases (decreases) and the demand for another commodity also decreases (increases), then the goods are said to be complementary to each other. There is a negative relationship between the price of a commodity and the demand for its complementary goods.