Here's a problem to solve: In the design process, a trade-off occurs when a problem is solved but a feature is sacrificed. Which of the following is an example of a trade-off?

Among the 4 following options, which is the correct answer?

- A: A car's gas mileage is increased and the engine has less power.
 
- B: An airplane uses a more efficient engine and has higher performance.
 
- C: A sports drink's taste is improved and has the same nutritional content.
 
- D: A computer company upgrades the hardware and the price remains unchanged.
 