Iwant to know all the part of computer system

I think the answer is A.

Explanation: Even without a fancy audio editing software, your computer can copy audio files, match the words actors speak with the movement of lips, and create your own ringtone. Matching words with lip movement is a skill you have to get better at, the same can be said with making your own ringtone. However with answer A, it explains more you can do with it. I'm not positive if this is right, but I hope is it, happy testing!