问题: [单选题]Some headphones can produce 3-D stereo sound effect. How did they achieve that?X1t答案窝(daanwo.com)-大学作业答案分享平台 ABy giving the same sound to different earsX1t答案窝(daanwo.com)-大学作业答案分享平台 BBy fooling us with commercialsX1t答案窝(daanwo.com)-大学作业答案分享平台 CBy giving slightly different sound to different earsX1t答案窝(daanwo.com)-大学作业答案分享平台 DBy combining visual and vocal cues