Final answer:
The simultaneous rightward shift of the demand curve and leftward shift of the supply curve for desktop computers definitively leads to a rise in the equilibrium price.
Step-by-step explanation:
When analyzing how shifts in demand and supply curves affect the market, we look at the effects on both equilibrium price and quantity. If the demand curve for desktop computers shifts rightward, this indicates an increase in demand at all price levels. Concurrently, if the supply curve shifts leftward, there is a decrease in supply, also affecting all price levels. When these two shifts occur simultaneously the equilibrium price will undoubtedly increase because the increased demand would tend to push the price up, and the decreased supply would tend to push the price up as well due to scarcity. However, determining the effect on the equilibrium quantity would require more information about the relative magnitude of the demand and supply shifts.
Therefore, the correct answer to the question is: B. the equilibrium price definitely rises.