In the Market for Fertilizer

In the market for fertilizer,

A) an increase in the wage rate paid to the workers who produce fertilizer increases the supply of fertilizer.
B) a decrease in the cost of equipment increases the supply of fertilizer.
C) an increase in the wage rate paid to the workers who produce fertilizer has no effect on the supply of fertilizer if the production of fertilizer is labor intensive.
D) an increase in income increases the supply of fertilizer if fertilizer is a normal good.