Only musicians and those in a music career can fully participate in the musical experience.

NO!! Music have become a rather important part of anyone's life. Even if one is not a musician or a singer, one often can enjoy listening to music and the fact that you can't sing but you sing because nobody cares how well you sing and simply because you like it! You like the feeling when you hear the musical sounds, when you hum with it, it (attempt) to jam with it. It's a fact, that applies to any field of music. You'd be surprised at how much sound wouldn't be in this world without those certain frequencies that fit together to make a string of melodious notes that can express as much as words. One may even consider that every single sound you hear is music, that every sound has a pitch and the sound of the whole world itself makes up a tremendous melody. It is not up to simply the exposure and opportunity to decide your participation in the musical experience. But those who are exposed and given the opportunity simply gives more attention to their musical perspectives and chooses to understand and interpret music with a deeper knowledge that not everyone has. And sometime even musicians themselves don't fully know the whole and every field of music because there are simply too many possibilities and ways for the different frequencies of sound to join together by creativity.

The answer would be d

The correct answer is wood^4