Recently , heavy rainfall in Manitoba caused flood damage to many homes in the province . Shortly thereafter , the price of plywood rose sign events suggest about the market for plywood ? a A decrease in the supply of plywood caused the price of plywood to rise . b . An increase in the supply of plywood caused the price of plywood to rise . An increase in the demand for plywood caused the price of plywood to rise . d . A decrease in the demand for plywood caused the price of plywood to rise