Answer:
5) an increase in the price of ostriches.
Step-by-step explanation:
Ostriches and goats in this example are subsituites goods. If a farmer raises one of the animals, he can't raise the other animal.
An increase in the price of ostriches, would increase the revenue farmers can earn from raising ostriches and this would lead to an increase in the supply of ostriches and a fall in the supply of goats.
A decrease in the price of goats leads to fall in the quantity supplied of goats.
An increase in the price of ostrich feed makes raising ostriches more expensive. Farmers would shift to the production of goats instead as a result and the supply of goats rises.
An increase in the demand for goats increases the supply of goats.
I hope my answer helps you