Answer: i could be wrong but im pretty sure its A state involving beliefs and feelings that causes a person to think or act in a certain way.
In psychology, attitude is a psychological construct, a mental and emotional entity that inheres in, or characterizes a person. They are complex and are an acquired state through experiences.
I would say D, since A and B would be highly irrelevant. C sounds like a possible answer, but could still be viewed as irrelevant since it doesn't actually contain info about MP3 players.
Haha well that is a tough one, it honestly matters what you feel strongly about so i cannot answer very well. but i suppose a nice subject would be how you feel about this world today, a very large topic but i am sure you can narrow it down<span />