Which of the Following Statements Is True

Which of the following statements is true?

A) The price elasticity of demand is positive when there is an inverse relationship between price and quantity demanded.
B) A positive income elasticity indicates that demand for a good rises as consumer income falls.
C) A positive cross-price elasticity for two goods and would arise if and were demand complements.
D) A negative cross-price elasticity for two goods and would arise if and were demand complements.