Which of the Following Statements Is True

Which of the following statements is true?

A) An increase in demand causes an increase in the equilibrium price; the increase in price causes supply to increase.
B) A decrease in supply causes the equilibrium price to rise; the increase in price then results in a decrease in quantity demanded.
C) If both demand and supply decrease,there must be a decrease in the equilibrium price; equilibrium quantity may either increase or decrease.
D) If demand increases and supply decreases one cannot determine if the equilibrium price will increase or decrease without knowing which change is greater.