Q: You are given a science question (hard-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.
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?
(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.
A:
A