The required "option is a) shift rightward".
Step-by-step explanation:
According to the condition given that is when there is a decrease in the price of corn, the supply of ethanol will increase as there will be more production of ethanol.
- If the curve of supply shifts towards left it means there is a decrease in the production as well as supply of the ethanol.
- If the curve of supply shift towards right it means there is the an increase in the production of ethanol.
- If the curve of supply is being unchanged or flattered it signifies that there will be more production of ethanol and supply will be less hence there will be no profit.
- Hence, the supply curve will shift rightward.