Answer:
C. increase if beef is a normal good; decrease if rice is an inferior good.
Explanation:
As the average income in China continues to increase, we would expect the demand for beef to increase if beef is a normal good and the demand for rice to decrease if rice is an inferior good.
Normal goods are goods whose demand increase with the increase in income of consumer, however, demand decreases with the decrease in the income of consumer as we know Income is a key factor, which affect the demand of goods and services. Examples of Normal goods are Beef, Pizza, etc.
Inferior goods are goods whoes demand decreases with the increase in income of consumer, however, demand increases with the decrease in the income of consumer. Examples of Inferior goods are Cereal, Rice, non branded noodles etc.