Because he was very curious to find the answer to his questions
Answer:
A
Explanation:
A claim is something that can be backed up by facts and data. B, C, and D are opinions while A can be backed up by information!
(The claim states that) Headphones should be modified for a safe volume level to protect hearing. (Some may disagree because) People would like to hear large amounts of volume, that may damage their ears. They may be destined for free-will, and choose to live their life the way they want. So what if manufacturers choose this way of making headphones, they may see some sales drop as many people don't actually care how loud things are.
It means fully conscious, or aware of what’s around them.
