Marston Enterprises sells three chemicals: petrol, septine, and tridol. Petrol's unit contribution margin is higher than septine's, which is higher than tridol's. Which one of the following events is most likely to increase the company's overall break-even point?

Multiple Choice

• A decrease in tridol's selling price.

• A change in the relative market demand for the products, with the increase favouring petrol relative to septine and tridol.

• An increase in the overall market demand for septine.