None of the above. Consider the market for shoes. A decrease in the price of a pair of shoes will lead to an increase in the number of pairs of shoes that individuals would like to buy. A decrease in the price of a pair of shoes will lead to a decrease in the number of shoes that sellers would like to sell. An increase in the price of shoes will lead to an increase in the supply of shoes.
Feet stink sometimes.
Assume that Guinness is a normal good. If people in the market area were to have more income, a. The demand for Guinness would decrease. The supply of Guinness would increase. The demand for Guinness would increase.