Which of the Following Statements Is True

Which of the following statements is true?

A) An increase in demand causes an increase in equilibrium price;the increase in price causes supply to increase.
B) A decrease in supply causes 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 equilibrium price;equilibrium quantity may either increase or decrease.
D) If demand increases and supply decreases one cannot determine if equilibrium price will increase or decrease without knowing which change is greater.