If two products are substitutes for each other, a change in the price of one product will change the demand for the other product in the opposite direction. For example, if the price of chicken goes down, the demand for beef will shift down to the left. As chicken is a substitute product for beef, a fall in the price of chicken will increase the consumption of chicken and the quantity demanded in the beef market will fall for all possible levels of price. In other words, substitute goods serve as replacements for one another. When the price of one rises, the demand for the other increases.

The correct answer is C.