Answer:
The tendency of the bird or the inclination to sing is innate in birds, however, the song, which is sung is learned. There exists an innate tendency to sing a song whether the bird is in seclusion or not. The birds possess sensitive/critical periods when they can produce memories of the songs they learn. The anterior forebrain pathway or the anterior vocal pathway is the template for learning a song by the bird.
Intestinal muscles and heart muscles are involuntary muscles,hand muscles and neck muscles are voluntary muscles
Answer:
b........................
I'm at a loss between A & C but I'm not sure, I'd go with A