Answer: Increase in demand
Step-by-step explanation: Change in demand occurs when factors affecting demand other the its price changes. While, a change in quantity demanded occurs when the price of the good changes other things constant. Since, jones cola and tucker cola are substitutes to each other. A rise in the price of jones cola will shift demand towards tucker cola. This, will lead to a rightward shift in the demand curve for tucker cola and an increase in demand for tucker cola.