If steak and potatoes are complements, when the price of steak goes down, the demand curve for potatoes:

Shift to the left

Explanation:

Demand curve is essential in economics, because it allows to know the relationship between the price of a particular goods/service and quantity demanded all in that price graphically

Since complementary goods are used along with each other, they also shift demands curve to the left because any fall at the price of one of the complement goods, the demands of first one increases, then the other one.

Therefore, If steak and potatoes are complements, when the price of steak goes down, the demand curve for potatoes Shift to the left

answer; schedule c;