Other Factors Being Unchanged, the Supply Curve for Eggs Will

Other factors being unchanged, the supply curve for eggs will shift downward and to the right if:

A) a virus spreads through poultry farms through the country and kills millions of chickens.
B) new research establishes that cholesterol, found in egg yolks, is found to cause heart disease.
C) the price of chicken feed falls.
D) the government introduces a new tax on poultry suppliers.
E) the average income level in the country falls due to a recession.